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Signal app not receiving notifications Android 15? Proven Fixes (2026)

Table of Contents

Hub: Social Media Error Fixes Hub

Quick Answer
A Signal app not receiving notifications Android 15 error is usually caused by Android 15’s stricter permission system, battery optimization settings, or outdated Signal versions. The fastest fixes include updating Signal to the latest version, granting Contacts permission, and disabling battery optimization for Signal. For persistent issues, checking lock screen notification settings or reinstalling the app often resolves the problem.

Why Signal app not receiving notifications Android 15 Happens

When a Signal app not receiving notifications Android 15 issue appears, it is often a frustrating experience. Unlike generic notification problems, this issue is frequently tied to Android 15’s stricter security and privacy features, which have introduced new challenges for messaging apps like Signal.

One of the primary causes is a permission-related bug. Android 15 introduced a new security mechanism that checks for Contacts permission even when Signal sends notifications that might involve contact information. This means that even if Signal doesn’t directly need access to your contacts to show a notification, the system may still block the notification if the Contacts permission is not granted. As one technical analysis explains, “当Signal应用尝试发送通知时，系统抛出了一个关键的安全异常… Signal应用在尝试访问联系人URI时被系统阻止，因为它缺少必要的’联系人’权限”[reference:0]. This behavior did not exist in previous Android versions and has caused widespread notification failures for Signal users[reference:1].

Battery optimization is another major factor. Android 15’s power management can put Signal to sleep in the background, delaying or preventing notifications entirely[reference:2]. Users have reported that notifications only appear when they manually open the app[reference:3][reference:4]. This is especially common on custom ROMs like LineageOS or GrapheneOS, where Google services may not be fully integrated[reference:5].

Additionally, Signal’s reliance on Google’s Firebase Cloud Messaging (FCM) for push notifications can be disrupted by poor internet connectivity, Google service outages, or the operating system simply deciding not to process push messages[reference:6]. For more social media troubleshooting, visit our Social Media Error Fixes Hub.

⚠️ Warning: Signal’s development team has confirmed that Android 15 notification issues are a known regression[reference:7][reference:8]. The fixes below address the most common causes, but some cases may require waiting for a Signal update.

1. Update Signal to the Latest Version

The Signal development team has been actively addressing Android 15 notification issues. Version 7.33.0 and above include critical fixes for the notification permission bug[reference:9]. Updating Signal is often the single most effective fix for Signal app not receiving notifications Android 15.

  1. Open the Google Play Store on your Android device.
  2. Search for “Signal” and tap on the app.
  3. If an “Update” button is visible, tap it to install the latest version.
  4. If you are using a custom ROM without Google services, download the latest APK from Signal’s official website.
  5. After updating, restart your device and test notifications.

✅ Expected Result: Notifications should start appearing normally. If the issue persists, proceed to the next method.

2. Check Notification Permissions

Android 15 has more granular notification controls than previous versions. Even if Signal’s in-app notification settings are correct, the system-level permissions may be blocking alerts, causing Signal app not receiving notifications Android 15.

  1. Open your phone’s Settings app.
  2. Go to Apps > Signal > Notifications (paths may vary slightly by device).
  3. Ensure “Show notifications” is toggled ON.
  4. Tap on each notification category (e.g., Messages, Calls, Group messages) and verify that “Show notifications” is enabled for each.
  5. Check that “Lock screen notifications” is set to “Show all notification content” or similar[reference:10].
  6. Test by sending yourself a message from another device.

💡 Quick Tip: On some Android 15 devices, there is an additional setting under Notifications > Advanced settings > App icon badges that should be enabled[reference:11].

3. Disable Battery Optimization

Android 15’s aggressive battery optimization is a common culprit behind Signal app not receiving notifications Android 15. When battery optimization is enabled, the system may prevent Signal from running in the background, delaying or blocking notifications[reference:12].

  1. Open your phone’s Settings app.
  2. Go to Apps > Signal > Battery (or Battery > Battery optimization, depending on your device).
  3. Select “Unrestricted” or “Don’t optimize” for Signal[reference:13].
  4. If you see a “Restricted” or “Optimized” option, change it to “Unrestricted”.
  5. On Samsung devices, also check Settings > Battery > Background usage limits and ensure Signal is not in the “Sleeping apps” list.
  6. Restart your device and test notifications.

🔁 Alternative Solution: On some devices, you may need to go to Settings > Apps > Special app access > Battery optimization and select Signal from the list.

4. Configure Lock Screen Notification Settings

Many users have reported that notifications disappear from the lock screen after updating to Android 15, even when the phone is unlocked[reference:14][reference:15]. This is a known regression that requires specific lock screen settings to fix.

  1. Open your phone’s Settings app.
  2. Go to Notifications > Lock screen notifications (or Lock screen > Notifications).
  3. Select “Show all notification content” or “Show notifications”[reference:16].
  4. Also check Notifications > Advanced settings > Notification history to see if notifications are being delivered but not displayed.
  5. Test by locking your phone and sending yourself a message.

❌ Common Mistake: Setting lock screen notifications to “Hide sensitive content” or “Don’t show notifications” will prevent Signal alerts from appearing on the lock screen, even if the phone is ringing or vibrating.

5. Disable Do Not Disturb Mode

Do Not Disturb (DND) mode can block Signal notifications entirely, even when the app is open. This is a simple but often overlooked cause of Signal app not receiving notifications Android 15.

  1. Swipe down from the top of your screen to open the quick settings panel.
  2. Look for the Do Not Disturb icon (usually a circle with a minus sign or moon symbol).
  3. If it is active, tap it to disable DND mode.
  4. Check Settings > Notifications > Do Not Disturb and ensure Signal is in the allowed list or that DND is completely disabled[reference:17].
  5. Test notifications.

💡 Quick Tip: On some devices, DND can be scheduled to activate automatically at certain times. Check the schedule settings to ensure it is not blocking Signal during important hours.

6. Grant Contacts Permission

As mentioned earlier, Android 15’s new security mechanism may require Contacts permission for Signal to send notifications properly[reference:18]. Granting this permission can resolve Signal app not receiving notifications Android 15 in many cases.

  1. Open your phone’s Settings app.
  2. Go to Apps > Signal > Permissions (paths may vary by device).
  3. Find “Contacts” and set it to “Allow”.
  4. If Contacts permission was previously denied, enabling it may immediately restore notifications.
  5. Test by sending yourself a message.

⚠️ Warning: This is a temporary workaround for the Android 15 permission bug[reference:19]. The ideal solution is to update Signal to version 7.33.0 or higher, which resolves the issue without requiring Contacts permission.

7. Disable VPN or Ad-Blocker

VPNs and ad-blockers can interfere with Signal’s notification delivery. One user reported that the ad-blocker Blockada was preventing Signal notifications entirely[reference:20]. Disabling these apps can restore notifications immediately.

  1. Disable any active VPN connections on your device.
  2. Go to Settings > Network & Internet > VPN and disconnect.
  3. If you are using an ad-blocker app (like Blockada, AdGuard, or similar), temporarily disable it.
  4. Test Signal notifications.
  5. If notifications return, consider whitelisting Signal in your ad-blocker or VPN app.

🔁 Alternative Solution: Some ad-blockers use a local VPN profile that can interfere with Signal’s connection to Google’s FCM push service. Switching to a DNS-based ad-blocker may be a more compatible solution.

8. Allow Background Activity

Android 15’s background restrictions can prevent Signal from maintaining the persistent connection needed for instant notifications, causing Signal app not receiving notifications Android 15.

  1. Open your phone’s Settings app.
  2. Go to Apps > Signal.
  3. Look for “Background activity” or “Background data” settings.
  4. Ensure that “Allow background activity” and “Allow background data usage” are enabled.
  5. Check “App permissions” and ensure “Run in background” is allowed.
  6. Test notifications.

💡 Quick Tip: On Samsung devices, go to Settings > Apps > Signal > Battery and ensure “Allow background activity” is toggled on.

9. Clear Signal Cache

Corrupted cache files can interfere with Signal’s notification system. Clearing the cache removes these files without affecting your messages or account. For a broader cleanup, see our how to clear cache guide.

  1. Open your phone’s Settings app.
  2. Go to Apps > Signal > Storage & Cache.
  3. Tap “Clear Cache”. Do not tap “Clear Data” unless you are prepared to log in again.
  4. Restart the app and test notifications.

❌ Common Mistake: Using third-party cleaner apps to clear Signal cache. These often fail to clear app-specific cache effectively. Always use the native settings menu.

10. Reinstall Signal

If clearing the cache and other fixes fail, a fresh installation is the next logical step. Reinstalling removes deeply corrupted configuration files that may be causing the Signal app not receiving notifications Android 15 error to persist.

  1. Press and hold the Signal icon and select “Uninstall”.
  2. Restart your device to clear any lingering system-level cache.
  3. Reinstall Signal from the Google Play Store or from Signal’s official website (if using a custom ROM).
  4. Log in and test notifications.

✅ Expected Result: Notifications should work after a clean reinstall. If the issue persists, proceed to advanced troubleshooting.

Advanced Troubleshooting for Signal app not receiving notifications Android 15

If none of the standard methods resolve the Signal app not receiving notifications Android 15 issue, deeper system-level problems may be involved. Here are advanced solutions for persistent cases.

Check for Google Services Issues:

  1. Signal relies on Google’s Firebase Cloud Messaging (FCM) for push notifications on most devices[reference:21].
  2. Ensure Google Play Services is up to date: Settings > Apps > Google Play Services > App info.
  3. If you are using a custom ROM without Google services (like GrapheneOS or LineageOS), Signal uses WebSocket connections that may be interrupted during deep sleep[reference:22].
  4. Consider updating to Signal 7.33.0 or higher, which includes improved WebSocket connection handling for non-Google environments[reference:23].

Reset App Preferences:

  1. Go to Settings > Apps > Reset app preferences (or similar).
  2. This resets all app permissions, notification settings, and default apps to their factory defaults.
  3. Reconfigure Signal’s permissions and test notifications.

Check for System Updates:

  1. Go to Settings > System > Software Update.
  2. Install any pending system updates, which may include fixes for notification issues.
  3. Some users have reported that Android 15’s notification cooldown feature can interfere with Signal[reference:24]. Check Settings > Notifications > Advanced settings for any cooldown or throttling options.

Generate a Debug Log:

  1. If the issue persists, Signal’s support team may request a debug log[reference:25].
  2. In Signal, go to Settings > Help > Debug log and follow the instructions to generate and share a log.
  3. This helps the development team identify the specific cause in your case.

Use Signal’s Test Version:

  1. If you are comfortable with testing software, consider joining Signal’s beta program to get the latest fixes before they are released to the public.
  2. Go to the Signal page in the Play Store and scroll down to find the beta program option.

If the issue persists after these advanced steps, the problem may be device-specific or require a fix from Signal’s development team. For more social media troubleshooting, explore our Social Media Error Fixes Hub or check the official Signal Support page.

Conclusion

Dealing with a Signal app not receiving notifications Android 15 issue is undeniably frustrating, especially when you rely on Signal for secure communication. However, the vast majority of cases are resolved with the methods above. Start with the simplest fixes—updating Signal and checking notification permissions—before progressing to more advanced solutions like disabling battery optimization or granting Contacts permission.

If you have tried every fix and Signal app not receiving notifications Android 15 still occurs, consider that the problem may be due to a known Android 15 regression that requires a future system update. Report the issue directly to Signal Support through the app’s “Help” section. For broader social media troubleshooting, explore our Social Media Error Fixes Hub.

For similar notification issues on other platforms, check out our guides on WhatsApp Notifications Not Showing or Telegram Connecting Infinite Loop.

Related Guides

FAQ

Why is Signal not showing notifications on Android 15?

This is often caused by Android 15’s stricter permission system requiring Contacts permission for notifications, battery optimization settings, or a known regression that affects lock screen notifications. Updating Signal to version 7.33.0 or higher resolves many of these issues.

How do I fix Signal notifications not working on Android 15?

Start by updating Signal to the latest version. Then check notification permissions, disable battery optimization for Signal, grant Contacts permission, and ensure Do Not Disturb is turned off. If the issue persists, clear the app cache or reinstall Signal.

Does Android 15 break Signal notifications?

Android 15 introduced a new security mechanism that checks for Contacts permission during notification delivery, which caused Signal notifications to fail. This is a known regression that Signal has addressed in version 7.33.0 and above.

Why do Signal notifications only appear when I open the app?

This usually indicates that battery optimization is putting Signal to sleep in the background. Disable battery optimization for Signal and ensure background activity is allowed. On custom ROMs without Google services, this can also be caused by deep sleep interrupting WebSocket connections.

Does granting Contacts permission fix Signal notifications on Android 15?

Yes, granting Contacts permission can temporarily resolve the Android 15 notification bug. However, the permanent solution is to update Signal to version 7.33.0 or higher, which fixes the issue without requiring Contacts permission.

Can a VPN or ad-blocker prevent Signal notifications?

Yes. VPNs and ad-blockers can interfere with Signal’s connection to Google’s push notification service. Disabling them temporarily or whitelisting Signal can restore notifications.

How do I fix Signal notifications not showing on the lock screen?

Go to Settings > Notifications > Lock screen notifications and select “Show all notification content.” Also check that Signal’s notification categories in Settings > Apps > Signal > Notifications are set to show on the lock screen.

Does reinstalling Signal fix notification issues on Android 15?

Yes, reinstalling Signal can resolve notification issues by removing corrupted configuration files. Make sure to restart your device before reinstalling for the best results.

HowToFixPro Editorial Team

We’re a team of system administrators, technical writers, and platform specialists who genuinely enjoy solving the problems most users find frustrating. From persistent Windows errors and Android sync failures to browser crashes and network drops — we’ve seen it all, and we document every fix properly. Our guides are built on official documentation, direct testing, and real troubleshooting experience. No filler, no guesswork — just reliable, step-by-step solutions you can trust.

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