Why is Signal not sending messages?

Message sending failures usually occur due to network issues, outdated app version, or account registration problems. Check your internet connection and ensure Signal is updated.

Why are Signal notifications delayed?

Delayed notifications can be caused by battery optimization settings, Do Not Disturb mode, or background data restrictions. Check your phone's notification and battery settings.

Why can't I register on Signal?

Registration requires a working phone number and SMS capability. Ensure your phone can receive SMS/calls, your number includes the country code, and try the 'Call me' option if SMS fails.

Why are Signal voice/video calls not working?

Call issues are typically caused by poor network connection, missing permissions, or firewall restrictions. Ensure you have microphone and camera permissions, and try switching between Wi-Fi and mobile data.

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Signal Not Working? How to Fix Signal Messenger Problems

Updated April 2026 · 7 min read

Quick Fixes

Signal prioritizes privacy and security. When it stops working, here's how to troubleshoot.

Common Causes of Signal Problems

Network connectivity issues: Poor Wi-Fi or mobile data signal
Outdated app version: Older versions may have bugs
Battery optimization restrictions: Phone killing Signal in background
Permission issues: Missing microphone, camera, or notification permissions
Account registration problems: SMS verification not arriving
VPN or firewall blocking: Network restrictions

Fix 1: Signal Not Sending Messages

Frequently Asked Questions

Why are my Signal messages not delivering?

Messages may show only one check mark if the recipient's phone is off or has no internet connection. Wait for them to come online, or check your own internet connection.

Can I use Signal on multiple devices?

Yes, Signal supports linking up to 4 devices. Go to Settings → Linked Devices → Link New Device. Your primary device must be connected for linked devices to work.

Why does Signal need so many permissions?

Signal needs camera and microphone for video/voice calls, contacts to help you find friends, and storage to send/receive files. You can deny some permissions if not using those features.

Is Signal down right now?

Check Signal's status page at status.signal.org or downdetector.com/signal to see if there are widespread issues.

How do I backup my Signal messages?

Go to Settings → Chat and settings → Chat backup → Enable. On Android, you can set up Google Drive backup; on iOS, use iCloud backup.