Last Updated: 16 June, 2026

Available Languages:

App Privacy

ALLWAPK.NET has explained below how the app uses your data. To learn more, please read the Privacy Policy.

Meta Description: Download the latest Signal APK for Android in 2026. Truly private messaging with end-to-end encryption by default, free HD calls, usernames, and zero tracking. Full guide inside.

Quick Answer

Signal is a free, open-source messenger developed by the non-profit Signal Foundation that offers end-to-end encrypted text, voice, video, and group calls — by default, with no exceptions. The latest Signal APK works on Android 5.0 and above, weighs around 80–110 MB, and is funded entirely by donations rather than ads or data sales. Download it from the Google Play Store, F-Droid, or directly from signal.org, and you’ll have the most privacy-respecting mainstream messenger on your phone.

Signal APK File Information

Detail	Value
App Name	Signal Private Messenger
Developer	Signal Foundation / Signal Messenger LLC
Headquarters	Mountain View, California, USA
Category	Communication
Latest Version	8.15.3 series (2026 builds)
File Size	~80–110 MB
Android Required	5.0 (Lollipop) and above
Architecture	Universal (ARM, ARM64, x86, x86_64)
Price	Free (donation-funded, no ads, no in-app purchases)
Downloads	100M+ on Google Play
Rating	4.4 / 5 (Google Play)
Source Code	github.com/signalapp (fully open source)
Official Website	signal.org

What Is Signal?

Signal is a privacy-first messaging app that does one thing better than anyone else: keep your conversations genuinely private. Where most messengers add encryption as a marketing checkbox, Signal builds its entire architecture around minimizing what anyone — including Signal itself can see, store, or hand over.

The app handles encrypted text messages, voice calls, video calls, group chats, group calls, file sharing, stories, and stickers. The difference is in what it doesn’t do: no ads, no analytics, no third-party trackers, no data sold to brokers, no algorithmic feeds, no read-receipt-by-default games. It’s a messenger built the way messengers would be if user data weren’t the product.

Who Owns Signal?

Signal is owned and operated by the Signal Foundation, a 501(c)(3) non-profit organization. It was co-founded by Moxie Marlinspike (the cryptographer who created the Signal Protocol) and Brian Acton (WhatsApp co-founder, who donated $50 million to launch the foundation in 2018). The current president is Meredith Whittaker, a well-known privacy and AI ethics researcher.

This structure matters: because Signal isn’t a for-profit company answering to investors, it has no commercial pressure to weaken encryption, harvest data, or monetize users. The funding model is donations from users and grants — that’s it.

Signal vs Signal-FOSS What’s the Difference?

The mainline Signal app on the Play Store includes Google’s FCM (Firebase Cloud Messaging) for push notifications, which is normal for Android apps. Some users prefer a Google-services-free build, and community forks such as Molly and Signal-FOSS exist on F-Droid for that audience.

• Signal (Play Store, signal.org) official, recommended for most users
• Molly community fork with extra hardening (database encryption with passphrase, Tor support)
• Signal-FOSS official source compiled without Google dependencies

For the vast majority of users, the mainline Signal app is the right choice.

Key Features of Signal Messenger

End-to-End Encryption by Default

Every message, every call, every photo, every voice note encrypted end-to-end automatically. There is no setting to turn it off, no “secret mode” you have to remember to enable. If you can see it in the app, it was end-to-end encrypted.

Voice and Video Calls

High-quality, end-to-end encrypted one-on-one voice and video calls over data. Quality holds up well on weak connections and the encryption is fully transparent you don’t see “secure call” badges because every call is secure.

Group Calls with up to 40 People

Group voice and video calls support up to 40 participants in a single end-to-end encrypted call. You can also share your screen during a call from the desktop client.

Disappearing Messages

Set a timer per chat (from 30 seconds to 4 weeks), and messages auto-delete on both your device and the recipient’s. You can also enable disappearing messages by default for all new chats under Privacy settings.

View-Once Media

Send a photo or video that can be opened only once and then disappears forever. Useful for sensitive content you don’t want sitting in someone’s gallery.

Note to Self

Every Signal account has a personal “Note to Self” chat a private encrypted scratchpad for reminders, links, and files that syncs across your linked devices.

Stories

Share photos, videos, and text posts that disappear after 24 hours, similar to other messengers — but stories are end-to-end encrypted and you control exactly which contacts see each one. There’s no algorithm pushing them to strangers.

Usernames (No Phone Number Sharing)

Signal now supports usernames, so you can chat with people without ever giving them your phone number. Set a username like @yourname.42 under Settings, and people can message you using that handle alone.

Sealed Sender Technology

Standard messengers reveal who is sending each message to their servers (even when content is encrypted). Signal’s sealed sender feature hides the sender identity from Signal’s own servers, so even Signal can’t tell who is messaging whom in many cases.

Screen Security (Anti-Screenshot)

Enable Screen Security to block screenshots inside the app and hide chat content from the Android app switcher / recents view. Useful if your phone is ever briefly out of your hands.

Stickers and Custom Sticker Packs

Signal ships with a built-in sticker store and lets anyone create and share custom sticker packs via a shareable link. The sticker creation tools are part of the app itself.

Edit Messages

You can edit sent messages within a 24-hour window. Recipients see an “edited” indicator so the change is transparent.

Message Reactions and Replies

React with any emoji, reply to specific messages with quote-thread display, and use formatting like bold, italic, monospace, and spoilers in your text.

Multi-Device Linked Sessions

Use Signal on your phone, tablet, iPad, and desktop (Windows, Mac, Linux) at the same time — each linked device gets its own end-to-end encrypted keypair tied to your main phone account. There’s no web client by design (more on that below).

---

How Signal’s Encryption Works

The Signal Protocol Explained

The Signal Protocol is the encryption standard Signal invented and open-sourced. It’s the gold standard in messaging encryption — so much so that it’s been adopted by WhatsApp, Google Messages RCS, Skype, Facebook Messenger’s secret chats, and many others.

In plain terms: every message gets its own unique encryption key, derived from a key exchange process between the two devices. Even if a single key is somehow compromised, past and future messages stay safe — a property called forward secrecy and future secrecy.

Double Ratchet and X3DH

Two cryptographic building blocks power the Signal Protocol:

• X3DH (Extended Triple Diffie-Hellman) — used to establish a shared secret between two parties the first time they message each other, even when one of them is offline.
• Double Ratchet — generates a fresh encryption key for every single message, so each one is independently secure.

Combined, they mean Signal’s encryption doesn’t just protect your conversation in flight — it protects each message individually, against any future key compromise.

Why Other Apps Use Signal Protocol Too

WhatsApp licensed the Signal Protocol in 2016. Google Messages added it for RCS conversations. Facebook Messenger uses it for secret chats. This is the highest possible vote of confidence: when your direct competitors adopt your protocol because nothing better exists, you’ve won the cryptography argument.

The difference is that Signal applies the protocol to everything by default, while those other apps apply it more selectively or alongside metadata-heavy infrastructure.

What’s New in the Latest Version

Signal’s recent release notes have focused on usernames, calling improvements, and storage efficiency:

• Usernames — chat without sharing your phone number
• Phone number privacy controls — hide your number from everyone in your contacts
• Edit messages — fix typos within 24 hours
• Improved Stories — better media handling and controls
• Group call improvements — bigger participant grid, better quality on weak networks
• Storage tools — bulk delete large media, see what’s taking space
• Performance and battery optimizations

Check Settings → Help → About for the exact build notes on your installed version.

System Requirements and Compatibility

Minimum Android Version

Android 5.0 Lollipop or higher. Older devices aren’t supported by the current APK.

Storage and RAM

At least 200 MB of free storage at install (more once chats and media accumulate) and 2 GB of RAM for smooth performance. The app is built to run on mid-range phones without issues.

How to Download Signal APK Safely

Official Sources

Signal is officially distributed through several channels — all are legitimate:

1. Google Play Store — the easiest and most automatic option.
2. signal.org/android/apk — Signal itself hosts the APK on its official site. Auto-updates check daily.
3. F-Droid — Signal-FOSS variant for users who avoid Google services.
4. Accrescent (advanced users) — privacy-focused alternative Android app store.

Why You Shouldn’t Use Signal Mod APKs

Searches for “Signal Mod APK,” “Signal Premium,” or “Signal Plus” lead to nothing legitimate — Signal has no premium tier, no locked features, and no ads to remove. Any APK claiming otherwise is:

• A wrapper for malware
• A session-stealing variant that copies your conversations
• A fake app impersonating Signal

Stick to the four sources above. If a download isn’t from one of those, don’t install it.

How to Install Signal APK on Android

1. Download the APK from signal.org or your chosen official source.
2. Allow unknown sources if installing outside Play. Go to Settings → Apps → Special app access → Install unknown apps, choose your browser or file manager, and toggle Allow.
3. Open the APK from your Downloads folder.
4. Tap Install, then wait for the process to complete.
5. Launch Signal and verify your phone number with the SMS code.
6. Grant the requested permissions — contacts, microphone, camera, notifications. All are expected for a messenger.
7. Set a Signal PIN when prompted (more on this below it’s important).
8. Optionally add a username under Settings → Profile.

Total time: under three minutes on a decent connection.

How to Install Signal on PC, Mac, and Linux

Signal has first-party desktop clients for every major platform:

• Windows — download from signal.org/download
• macOS — native client with full feature parity
• Linux — official .deb package and Flatpak builds

To set up:

1. Install the desktop client.
2. Open it and you’ll see a QR code.
3. On your phone, go to Signal → Settings → Linked Devices → Link New Device and scan the QR code.
4. Wait a moment for chat history to sync.

Note: Signal deliberately does not offer a web client. That’s a security choice a browser-based client would expand the attack surface and depend on the browser vendor for delivery. The desktop apps are first-party binaries you install directly.

How to Update Signal to the Latest Version

• Play Store route: open the Play Store, search Signal, and tap Update.
• APK route: the APK installed from signal.org checks daily for updates and prompts you when one is available. Tap, install, and you’re current.
• F-Droid route: F-Droid handles updates automatically through its standard update mechanism.

How to Set Up Signal Beginner’s Guide

Registering with Phone Number

Open the app, choose your country code, and enter your phone number. Signal sends a 6-digit SMS verification code. Enter it to activate your account.

Setting a Signal PIN

Signal will prompt you to create a PIN during setup. This isn’t a password to unlock the app — it’s the key that lets you recover your contacts, profile, and settings if you reinstall or change devices. Pick something at least 4 digits long. You can use an alphanumeric PIN for stronger security.

Adding a Username

Go to Settings → Profile → Username and pick a unique handle (e.g., yourname.42). Once set, people can message you using your username alone, and you can choose whether your phone number is discoverable separately.

Inviting Contacts

Signal scans your contacts and shows which ones already use Signal. You can also invite contacts via SMS or share your Signal handle link directly.

Linking a Desktop Device

Open Settings → Linked Devices → Link New Device and scan the QR code displayed in the Signal desktop app. The link is end-to-end encrypted and your phone remains the master device.

How to Use Signal Like a Pro

Enabling Disappearing Messages by Default

Go to Settings → Privacy → Default Timer for New Chats and set a default disappearing-message timer (e.g., 1 week). Every new chat you start will use that timer automatically.

Using Note to Self

Tap the pencil icon to start a new chat, then select Note to Self at the top. Anything you send there is end-to-end encrypted and syncs to your linked devices — a private encrypted personal notebook.

Setting up Two-Factor Verification (Registration Lock)

Under Settings → Account → Registration Lock, toggle it on. This requires your Signal PIN when you (or anyone with your SIM) tries to re-register your number on a new device. It’s the single best protection against SIM-swap attacks.

Configuring Privacy Settings

Spend two minutes in Settings → Privacy:

• Screen Lock — require biometric or device PIN to open Signal
• Screen Security — block screenshots inside the app
• Read Receipts — toggle whether others see when you’ve read messages
• Typing Indicators — toggle whether others see “typing…”
• Block Unknown Senders — auto-filter messages from non-contacts
• Always Relay Calls — route calls through Signal’s servers to hide your IP from contacts

Signal Privacy and Security Deep Dive

What Data Signal Collects (Almost Nothing)

This isn’t marketing language — it’s verifiable in Signal’s open-source code and confirmed by multiple court records. Signal stores:

• Your phone number
• The date you registered
• The last day you connected (only the date, not time or location)

That’s it. No contact graph, no message metadata, no location, no IP logs, no behavior analytics.

Sealed Sender and Metadata Protection

Even Signal’s servers don’t know who is sending most messages. Sealed sender wraps the sender identity in additional encryption that only the recipient can unwrap. The server sees “a message is going to user X” without knowing who sent it.

Private Contact Discovery

When you allow Signal to scan your contacts, the matching happens inside a secure enclave (Intel SGX) on Signal’s servers. Even Signal cannot see your contact list — only the cryptographic intersection between your contacts and Signal’s user database.

Local Database Encryption

The chat database on your device is encrypted using SQLCipher. If someone physically takes your phone, the chat database isn’t readable without your device unlock.

Registration Lock PIN

Your Signal PIN does two jobs: it’s the key to recovering your profile and contacts after reinstall, and it’s the second factor that prevents someone with your phone number from hijacking your account.

Is Signal Really Safe?

The short answer: by every measure available, yes. The longer answer requires understanding what’s been independently verified.

Independent Security Audits

The Signal Protocol has been formally verified by academic cryptographers. Signal’s apps have been audited by external security firms. The clients are fully open source, and security researchers continuously inspect them.

Government Subpoenas and Signal’s Responses

Signal has been subpoenaed multiple times by U.S. courts and other governments. Each time, the data Signal has been able to provide has been the same trivial set: phone number, registration date, and last connection date. This is because that’s literally all Signal has — not because it refuses to share more. Court records are public and consistent on this point.

Open Source Verification

The entire client (Android, iOS, Desktop) and the server code are open source on GitHub. Anyone can audit, build, and verify. Reproducible builds let researchers confirm that the APK on the Play Store matches the source code.

How Signal Is Funded

Signal is funded by:

• Donations from individual users (you can donate inside the app under Settings → Donate)
• Major gifts like Brian Acton’s $50M founding donation
• Grants from privacy-focused foundations

There are no ads, no in-app purchases, no premium tier, no enterprise plan, no data sales. This funding model is part of why Signal can stay aligned with users’ privacy interests rather than advertisers.

Is Signal Banned in Any Country?

Signal’s availability varies regionally. Status changes always check current sources for your country.

Signal in Pakistan, India, UAE, Saudi Arabia

• Pakistan — generally accessible.
• India — accessible; Signal saw a major user influx after the 2021 WhatsApp privacy policy change.
• UAE — VoIP calling on Signal is restricted under general UAE VoIP regulations. Text messaging works.
• Saudi Arabia — broadly accessible.

Signal in China, Iran, Russia

• China — blocked by the Great Firewall. A VPN is needed.
• Iran — has been blocked at various points.
• Russia — has been restricted intermittently and Signal has documented censorship in this market.

Signal’s Built-in Censorship Circumvention

Signal has a built-in censorship circumvention feature under Settings → Privacy → Advanced → Censorship Circumvention. When you enable it, Signal routes traffic in a way that’s harder for state-level censors to identify and block. This works in countries where Signal is actively filtered.

Troubleshooting Common Signal Problems

Signal Not Sending Verification Code

• Confirm your number is entered with the correct country code.
• Wait at least 60 seconds before requesting a resend.
• Try the voice call verification option.
• Some carriers temporarily filter Signal’s verification SMS — try the voice option as a workaround.
• Reboot your phone and re-attempt; transient SMS delivery issues are the most common cause.

Signal Calls Not Connecting

• Grant Microphone and Camera permissions.
• Test on Wi-Fi vs mobile data to isolate the issue.
• Enable Always Relay Calls under Privacy if your network blocks peer-to-peer connections.
• In regions with VoIP restrictions (notably UAE), Signal calling may be blocked at the network level.

Notifications Delayed or Missing

• Disable battery optimization for Signal: Android Settings → Battery → Background restriction → Allow.
• Confirm Signal has notification permissions.
• Check Signal Settings → Notifications to confirm both message notifications and call notifications are enabled.
• On some Chinese manufacturer ROMs (MIUI, EMUI, OxygenOS), additional autostart and background permission toggles are required.

Can’t Restore Backup

• Signal backups are local-only on Android (intentional — there’s no cloud backup option for privacy reasons). You must transfer the backup file manually.
• Make sure you have your 30-digit backup passphrase.
• Place the backup file on your new device’s internal storage and select Restore Backup during initial setup, before linking your account.

Linked Device Not Syncing

• Re-scan the QR code from your phone to re-link.
• Confirm both devices are on the latest version.
• Check that your phone hasn’t been offline for too long linked devices need periodic contact with the master to stay synced.

Signal vs Other Messaging Apps

Feature	Signal	WhatsApp	Telegram	IMO	Threema
Default E2E encryption	✅ Always	✅ Always	❌ Cloud chats not E2E	Personal chats E2E	✅ Always
Open source (client)	✅	Partial	✅ Client / ❌ Server	❌	✅
Phone number required	Optional with username	Required	Required (anonymous via Fragment)	Required	Not required
Metadata minimization	✅ Sealed sender	Partial	Limited	Limited	✅
Group call size	40	32	Thousands	Limited	8
Funding model	Non-profit donations	Meta (ad ecosystem)	Pavel Durov / Premium	Ad-supported	Paid app
Cloud chat sync	❌ By design	Manual backup	✅ Built-in	✅	Local
Disappearing messages	✅ Per chat / default	✅	Secret Chats / auto-delete	Limited	✅

Signal vs WhatsApp

WhatsApp uses the Signal Protocol for E2E encryption, so the encryption itself is comparable. The differences are around everything outside the messages: WhatsApp is owned by Meta and shares metadata with the Meta ecosystem; Signal is non-profit and minimizes metadata aggressively. WhatsApp has billions more users — Signal has stronger privacy guarantees. For most people, both can coexist on your phone.

Signal vs Telegram

Telegram has way more features, way bigger groups, channels, bots, and cloud sync — but only its Secret Chats are end-to-end encrypted, and they don’t sync across devices. Signal is the better choice if privacy is your priority; Telegram is the better choice if you want a social platform layered on top of messaging.

Signal vs IMO

IMO is optimized for free international calling on weak networks across the developing world. Signal is optimized for privacy and security. Different priorities, different tools many users have both.

Signal vs Threema

Threema is another strong privacy-focused messenger, paid (about €5 one-time) and based in Switzerland. It doesn’t require a phone number at all. Signal is free, has a larger user base, and uses the more widely-audited Signal Protocol. Threema’s main appeal is jurisdiction (Swiss data protection laws) and not needing a phone number at registration.

Pros and Cons of Signal

Pros

• End-to-end encryption on every chat by default, no exceptions
• Open source code anyone can audit
• Non-profit funding model — no ads, no data sales, no tracking
• Sealed sender and minimal metadata
• Usernames let you chat without sharing your phone number
• Built-in censorship circumvention
• Excellent voice and video call quality
• Disappearing messages by default
• Cross-platform desktop apps
• Free with no premium tier

Cons

• No cloud backup (intentional, but inconvenient if you switch phones often)
• No web client (intentional)
• Smaller user base than WhatsApp — you have to convince contacts to switch
• Fewer “fun” features compared to Telegram (no channels, no bots, no large groups)
• Group call cap of 40 is smaller than competitors
• VoIP calling restricted in some Gulf countries

Best Alternatives to Signal in 2026

1. WhatsApp — biggest user base, uses the same Signal Protocol for encryption.
2. Threema — Swiss-based, paid, no phone number required.
3. Wire — open source, end-to-end encrypted, business-focused.
4. Session — anonymous messenger with no phone number and onion-routed messages.
5. Element / Matrix — federated open protocol with self-hosting options.

How to Backup and Restore Signal Chats

Signal backups on Android are local-only and encrypted with a 30-digit passphrase. Here’s the process:

To create a backup:

1. Go to Settings → Chats → Chat Backups → Turn On.
2. Signal generates a 30-digit passphrase. Write it down and store it safely — there is no recovery if you lose it.
3. Choose a backup location on your device.
4. Signal will create a new backup every night.

To restore on a new device:

1. Copy the backup file to your new phone’s internal storage at /Signal/Backups/.
2. Install Signal but do not register yet.
3. On the first launch, tap Restore Backup before entering your phone number.
4. Enter the 30-digit passphrase.

If you lose the passphrase, the backup is unrecoverable — even Signal cannot help. This is by design.

How to Delete Your Signal Account

1. Open Signal.
2. Go to Settings → Account → Delete Account.
3. Confirm your phone number to proceed.
4. Your account is wiped from Signal’s servers immediately, along with all profile data, contacts, and group memberships.

Local chat history on your device is also removed.

Real User Reviews and Ratings

Signal averages 4.4 stars across more than 100 million Play Store downloads. Recurring user themes:

• Heavy praise for the privacy posture and lack of ads
• Strong endorsements from journalists, activists, and security researchers
• Some users complain about the lack of cloud backup
• Some users wish for larger group features and channels
• Users in restrictive countries praise the censorship circumvention feature
• Overall sentiment is consistently positive among privacy-conscious users

Expert Verdict Is Signal Worth Downloading?

If privacy is something you actually care about — not as a buzzword, but as a real concern Signal is the messenger you should install. It’s the recommendation of every reputable security researcher, every privacy advocate, every journalist working with sensitive sources, and even the inventors of the very encryption protocol that competitors had to license.

Signal isn’t the messenger your entire family already uses. It doesn’t have channels, bots, or 200,000-person groups. It doesn’t have ads or premium tiers because it isn’t a business. What it does have is the strongest privacy guarantees any mainstream messenger can offer, a non-profit owner with no commercial pressure to weaken them, and a track record that holds up in court records.

For most people, the right move is to install Signal alongside whatever else you use — and gradually migrate the conversations that actually matter to a place where they’re genuinely private.

Frequently Asked Questions

1. Is Signal APK safe to download? Yes, when downloaded from the Play Store, signal.org, or F-Droid. Avoid any third-party “Signal Mod” or “Signal Plus” APKs — they’re not real and almost always contain malware.

2. Is Signal completely free? Yes. Signal is free with no premium tier, no ads, no in-app purchases. It’s funded by donations and grants. You can optionally donate inside the app under Settings → Donate.

3. Does Signal really not collect my data? Signal stores only your phone number, registration date, and last connection date. Multiple court records have confirmed this is all they can produce when subpoenaed. The code is open source so you can verify this independently.

4. Can I use Signal without sharing my phone number? You need a phone number to register, but once you have an account you can set a username under Settings → Profile and chat with others using that handle alone. You can also hide your phone number from everyone except your existing contacts.

5. Why does Signal need my phone number to sign up? Signal uses phone numbers as a spam prevention mechanism — it’s hard to mass-create accounts when each one needs a unique number. The team has historically said they’d remove this requirement if they found a better anti-spam mechanism.

6. Does Signal have a web version? No, intentionally. A browser-based client would be more vulnerable to attacks. Use the official Signal Desktop app for Windows, Mac, or Linux instead.

7. Is Signal banned in any country? Signal is blocked or restricted in several countries including China, Iran (intermittently), and others. The app has a built-in censorship circumvention feature for users in restrictive regions.

8. Why doesn’t Signal have a cloud backup? Cloud backups would require Signal to either hold encryption keys (defeating end-to-end encryption) or rely on the user to remember a strong passphrase forever. Signal chose local backups with a 30-digit passphrase as a privacy-preserving compromise.

9. How many people can join a Signal group call? Up to 40 participants in a single end-to-end encrypted group voice or video call.

10. Is Signal better than WhatsApp? For privacy: yes, clearly. WhatsApp uses the same encryption (Signal Protocol) for message content, but it’s owned by Meta and shares metadata with the broader Meta ecosystem. For features and user reach: WhatsApp wins. Many people use both.

11. What is the Signal Protocol? The Signal Protocol is the end-to-end encryption standard invented by Signal and now used by WhatsApp, Google Messages RCS, Facebook Messenger’s secret chats, and others. It provides forward secrecy and future secrecy — every message gets its own unique key.

12. Can Signal be hacked? No mainstream attack has ever broken the Signal Protocol itself. The realistic risks are device-level: malware on your phone, someone physically taking your unlocked device, or social engineering attacks. Use Screen Lock, Registration Lock, and a strong PIN to mitigate these.

13. How do I enable disappearing messages by default? Go to Settings → Privacy → Default Timer for New Chats and pick a duration. Every new chat will use that timer automatically.

14. What is a Signal PIN? Your Signal PIN is the key that lets you restore your contacts and profile after reinstalling Signal. It’s not a password to unlock the app — that’s Screen Lock, which is separate. Set both for the best protection.

15. Why am I not getting Signal verification code? Most often a carrier delivery issue. Wait 60 seconds and try Resend, or use the voice call verification option. Some carriers temporarily filter Signal SMS.

16. Can I use Signal on multiple devices? Yes — phone, desktop (Windows, Mac, Linux), and tablet can all be linked to a single account. There’s no fixed device limit, though each linked device has its own keypair.

17. How do I change my Signal phone number? Go to Settings → Account → Change Phone Number, follow the verification flow with your new number, and your chats and profile carry over.

18. Does Signal store my contacts? Signal uses a privacy-preserving technique called private contact discovery that runs inside a secure enclave. Even Signal’s servers cannot see your contact list — only the cryptographic intersection of your contacts with Signal’s user database.

19. Is Signal owned by Facebook or Google? No. Signal is owned by the Signal Foundation, an independent non-profit organization based in California. It has no ownership relationship with Facebook, Google, or any other large tech company. Brian Acton, who funded the launch, is a co-founder of WhatsApp who left Facebook over privacy disagreements.

20. Can I make group calls on Signal? Yes. Group voice and video calls support up to 40 participants, all end-to-end encrypted. You can also share your screen from the desktop client during a call.

21. Does Signal use a lot of battery? Signal is generally efficient. The main battery considerations are background sync and notifications — both can be tuned under Settings. Disable battery optimization for Signal to ensure notifications arrive reliably.

22. Is Signal anonymous? Signal is private, not anonymous. Your messages and metadata are protected, but registering requires a phone number. If you want anonymous messaging without a phone number, look at Session or Briar.

Final Thoughts

Signal is the messenger that exists to do one thing right: actually keep your conversations private. It doesn’t pretend to be a social platform, a publishing tool, or a cloud storage service. It’s a messenger, and it’s the best messenger anyone has built when “best” means “your conversations stay yours.”

Download the APK from the Play Store, signal.org, or F-Droid. Spend five minutes setting your PIN, enabling Registration Lock, and turning on disappearing messages by default. Add a username so people can reach you without your phone number. Then invite your contacts.

The conversations that matter most deserve a tool built with their privacy as the only priority. Signal is that tool.

About the Author

Written by your editorial team — a group of mobile-app reviewers and privacy-tools researchers who have used and tested Signal continuously since the TextSecure era, evaluated competing secure messengers across Android, iOS, and desktop, and followed the public security audits and legal records around Signal closely. We update this guide whenever Signal ships a major version.