You could check if your two friends happened to recently change their own cellular providers. If so, your own phone companies may be slow in updating their routing tables. I would give them a few ...

How to enter Safe Mode on your Android phone - and when's the right time to do it ...

Users have noticed that Samsung has a skinned version of Google Messages on the Galaxy S22, even though the name and the Google Play Store link are the same as what you’d see on a non-Samsung phone.

Leaving your phone plugged in for hours only to realize the battery isn't charging is incredibly frustrating, but the fix is often simpler than it seems.

While smartphone manufacturers might devise ways for phones to last longer before needing a charge, it really comes down to the users and their habits.