If no notifications are received on Android**, applications can run in the background, but messages, calls, or alerts are not displayed. The main reasons are battery settings, background activity restrictions, or Do Not Disturb mode.
Below are quick fixes.
Method 1: Checking notification settings
- Open Settings → Applications → Application Name → Notifications
- Make sure that notifications are enabled
- Allow display on the lock screen and in banners
Method 2: Do Not Disturb mode check
- Open Settings → Sound and Notifications → Do Not Disturb
- Make sure that the mode is turned off or configured correctly.
- Check the exceptions for important applications
Method 3: Check background activity and optimize battery
- Open Settings → Battery → Battery Optimization
- Find the problematic application
- Select Do not optimize
Method 4: Reboot the device
- Sometimes background processes hang
- Restart your phone and check the notifications again
Additional reasons
- Errors in the Android firmware
- Internet connection restrictions for background data
- Third-party notification blockers
Bottom line
Turning on notifications, disabling battery optimization, and checking the Do Not Disturb mode most often helps. If notifications do not arrive even after a reboot, there may be a problem with the firmware or Internet connection.