If the Android app doesn’t receive notifications and you only get messages when opening the app, or notifications arrive without sound, please try the following steps:
Go to Telegram Settings > Notifications and Sounds, make sure that notifications are ON and Importance is set to “High” or greater.
Check whether the contact or group is muted.
Make sure Google Play Services are installed on your phone.
Check notification priority for Telegram in Android settings, it may be called Importance or Behavior depending on your device.
If your phone uses some battery saving software (Clean Master, Security Master, 360 Security, Go Task Manager, etc.), make sure that Telegram is whitelisted in that application.
If your system has a task killer (Android 6 and higher), make sure that Telegram is in the list of allowed apps in those devices' security settings.
Here's a list of the most popular task killers.
Note: These settings may look slightly different on various Android devices from smaller brands. If your device is not on the list, locating a similar setting and applying it should fix your notifications problem.
If these steps don’t help you, please contact our Volunteer Support via Settings > Ask a Question.