No signal when messages are received
It might be helpful to know which cell phone it is.
Which App? SMS, Whatsapp, etc?
And which smartphone model?
Actually, you can allow apps on any smartphone nowadays via the settings, or just not allow you to display notifications.
We don't know which smartphone it is now. But if you search in the settings, you will certainly find the appropriate permissions.
With my Samsung I can even search in the settings (keyword "authorization" "notification" etc.). You should find everything you need.
Do you have a cleaner app on your phone? If so then uninstall because these apps cause such problems. I don't mean the optimizer from Huawei. The energy saving mode can also cause this, if activated then deactivate.
Generally or with a specific app?
As a general rule.
Huawei 2020
Huawei 2020
Then you need to set up the notification properly.
