Android notifications can fail in very different ways. One app may stop alerting you, every app may go quiet, messages may arrive only after you open the app, or notifications may appear without sound.
Those symptoms do not all have the same cause.
The fastest way to fix the problem is to first identify what is actually missing.
Start With the Symptom
Use this quick check before changing settings.
Only one app is affected
Focus on that app’s notification permission, notification categories, in-app settings, battery access, background data, and account sync.
Many apps are affected
Check Do Not Disturb, Battery Saver, network connectivity, Android system settings, and recent system updates.
Notifications arrive only after you open the app
This usually points to a background restriction. The app may not be allowed to run or use data while it is closed.
Notifications appear but make no sound
Android is delivering the notification. The problem is usually the notification channel, sound setting, volume, Do Not Disturb, or Bluetooth routing.
Notifications are missing only from the lock screen
The issue is probably lock-screen privacy or notification-display settings rather than notification delivery itself.
Once you know which pattern matches your phone, use the relevant section below instead of changing every notification setting on the device.
When Only One App Is Not Sending Notifications
Start with the app itself.
Open:
Settings > Notifications > App notifications
Select the affected app and make sure notifications are allowed.
On many Android phones, you can also use:
Settings > Apps > [App name] > Notifications
The exact wording varies by manufacturer.
Check notification categories
An app can have its main notification switch turned on while a specific category is disabled.
For example, a messaging app may allow call notifications but block message alerts.
Open the app’s notification settings and look for categories such as:
- Messages
- Calls
- Reminders
- Downloads
- Incoming mail
- General notifications
Turn on the category that matches the alert you are missing.
Check the app’s own notification settings
Some apps have a second layer of notification controls inside the app.
This is common with email, messaging, calendar, banking, and social apps.
Open the app and check its own Settings > Notifications or similar menu.
Android can allow notifications while the app itself is configured not to send them.
For Gmail-specific problems, use Gmail Notifications Not Working on Android because Gmail also depends on account sync, labels, and its own notification settings.
Notifications Arrive Only When You Open the App
This is one of the most useful symptoms because it strongly points toward background activity being restricted.
Check the app’s battery settings first.
Open:
Settings > Apps > [App name] > Battery
Depending on the phone, you may see options such as:
- Unrestricted
- Optimized
- Restricted
- Allow background activity
For apps where timely alerts matter, such as messaging, email, security, or authentication apps, temporarily test with a less restrictive battery setting.
Do not make every app unrestricted. That can increase battery use unnecessarily.
Check background data
Open:
Settings > Apps > [App name] > Mobile data
or:
Settings > Apps > [App name] > Mobile data & Wi-Fi
Make sure the app is allowed to use background data.
Also check whether Data Saver is active.
A common path is:
Settings > Network & internet > Data Saver
If notifications work on Wi-Fi but fail on mobile data, background data restrictions deserve particular attention.
Samsung users should check Sleeping Apps
Samsung phones can place apps into Sleeping or Deep sleeping states.
Open:
Settings > Battery > Background usage limits
Review:
- Sleeping apps
- Deep sleeping apps
- Never auto sleeping apps
A messaging or email app placed in Deep sleeping apps may not receive alerts normally while closed.
This is one of the first Samsung-specific settings I would check when notifications appear only after opening the app.
Notifications Appear but Make No Sound
A visible notification with no sound is different from a missing notification.
Start with the affected app:
Settings > Apps > [App name] > Notifications
Open the relevant notification category and make sure it is set to Alerting rather than Silent.
Then check:
- Notification volume
- Notification sound
- Vibration
- Do Not Disturb
- Bluetooth devices
- Smartwatch or wearable routing
Some phones separate ringtone and notification volume, so raising the ringtone volume may not change notification sound.
Also disconnect Bluetooth temporarily. An alert can sometimes be routed to connected earbuds, a car, or another Bluetooth device.
Notifications Are Missing From the Lock Screen
When notifications appear after unlocking the phone but not on the lock screen, check lock-screen notification settings.
Open:
Settings > Notifications > Notifications on lock screen
Depending on the phone, you may be able to:
- Show all notification content
- Hide sensitive content
- Show notification icons only
- Hide all lock-screen notifications
If you can see an icon but not the message itself, the phone is probably hiding sensitive content rather than failing to receive the notification.
Many Apps Have Stopped Sending Notifications
When several unrelated apps fail at the same time, it is less likely that every app independently changed its settings.
Start with system-wide features.
Turn off Do Not Disturb temporarily
Open Quick Settings and check whether Do Not Disturb is active.
Or open:
Settings > Notifications > Do Not Disturb
Turn it off temporarily and send yourself another test notification.
If notifications return, inspect any schedules or automatic rules rather than leaving Do Not Disturb disabled permanently.
Turn off Battery Saver for testing
Battery Saver can reduce background activity.
Open:
Settings > Battery > Battery Saver
Turn it off temporarily.
If notifications begin arriving normally, the next step is to identify which app is being restricted rather than permanently disabling every battery-saving feature.
Check the internet connection
Push notifications depend on a working connection.
Try loading a webpage and testing another online app.
If notifications arrive in a batch as soon as Wi-Fi or mobile data reconnects, the notification system may be fine. The real problem is connectivity.
Check Whether Android Received the Notification
Notification History can help distinguish a delivery problem from a display problem.
On supported devices, open:
Settings > Notifications > Notification history
If the supposedly missing notification appears there, Android did receive it. It may have been dismissed, hidden, displayed silently, or blocked from appearing on the lock screen.
If nothing appears in Notification History, the alert may never have reached Android.
Notification History must already be enabled before Android can use it as a useful log, so turning it on now will mainly help with future missed alerts.
Restart Before Making Bigger Changes
A normal restart can clear temporary problems involving the app process, System UI, Google Play Services, or background connections.
Restart the phone once and test again.
I would not factory-reset a phone because notifications stopped working. Notification failures are much more commonly caused by app settings, battery restrictions, sync, or background data than by a phone-wide failure requiring data erasure.
Update the App and Android
If the problem started recently, check for updates.
Open Google Play Store and update the affected app.
Then check Android system updates using the update menu provided by your phone manufacturer.
Samsung commonly uses:
Settings > Software update > Download and install
Other Android phones may use:
Settings > System > Software update
A newer app or system update can correct notification bugs introduced by an earlier release.
Clear the App Cache When One App Still Misbehaves
When one app remains affected after its permissions and background settings look correct, clearing its cache is reasonable.
Open:
Settings > Apps > [App name] > Storage & cache > Clear cache
This removes temporary files without intentionally deleting the app’s account or personal data.
Do not confuse Clear cache with Clear storage or Clear data. The latter can sign you out and remove local app information.
For a fuller explanation, see How to Clear Cache on Android Without Losing Data.
Check Account Sync for Email and Calendar Apps
Some notifications depend on new information being synchronized first.
Open:
Settings > Accounts
or:
Settings > Passwords & accounts
Select the relevant account and make sure sync is active for the service you need.
This is particularly important for:
- Calendar
- Contacts
- Cloud services
A notification cannot appear for new synchronized content if the content itself is not being synchronized.
When Notifications Stopped After an Android Update
Do not immediately assume the update damaged the phone.
Use this order:
- Restart the phone.
- Update the affected apps.
- Recheck notification permission.
- Recheck notification categories.
- Check battery and background-data restrictions.
- Install any newer Android or Google Play system update that is available.
- Clear the affected app’s cache.
- Reinstall the app only if the problem is limited to that app.
Major Android updates can change permissions and background behavior, so settings that worked before the update are worth checking again.
Test Safe Mode When the Problem Started After Installing an App
Safe Mode temporarily disables downloaded apps.
It is useful when a cleaner, battery manager, antivirus app, automation tool, launcher, theme, VPN, or notification manager may be interfering.
The method varies between manufacturers, but on many Android phones you can open the power menu, touch and hold Power off, and choose Safe mode.
If notifications work normally in Safe Mode, a downloaded app is probably involved.
Start by removing apps installed shortly before the problem began, especially apps that manage battery, memory, notifications, security, accessibility, or automation.
If you have trouble returning to normal mode afterward, use Android Stuck in Safe Mode? Here’s How to Fix It.
Reinstall Only the App That Remains Broken
Reinstallation makes sense when one app still refuses to send notifications after you have checked its permissions, categories, battery access, background data, sync, updates, and cache.
Before uninstalling, make sure you know the login credentials and confirm that important local data is backed up.
Then uninstall the app, restart the phone, reinstall it from Google Play, sign in, and allow notifications when prompted.
Test it before changing anything else.
When the Notification Shade Itself Is Broken
A different problem exists when notifications are present but Android’s notification interface is malfunctioning.
Examples include:
- The notification shade will not open
- Quick Settings freezes
- Status-bar icons disappear
- Notifications cannot be expanded
- Navigation or other system controls also behave strangely
That points more toward System UI than toward one app’s notification settings.
Use How to Fix System UI Has Stopped on Android for that problem rather than repeatedly changing app notification permissions.
The most important distinction is whether Android is not receiving the alert, receiving it but hiding it, or preventing the app from working in the background. Once you identify which of those is happening, the number of settings you actually need to change becomes much smaller.
