Android-specific: common causes and fixes

Instructions:

1. 
   Perform system and provider updates:
   
   
   Settings → System → System Update
   
2. 
   Check mobile network provider profiles:
   
   
   Settings → Network & Internet → Mobile Network → SIMs
   
3. 
   Check or create APN:
   
   Check the access points and correct the values if necessary.
4. 
   Clear device cache:
   
   Restart the device
   
   to delete temporary network data
   
   .

   These measures usually resolve connection and profile issues on Android.