Hello Karen424
Sorry to hear of the mobile issues experienced, we appreciate you taking the time to raise this via the forums and welcome to the community.
How long have you been experiencing the issues? Is it this way everywhere or in specific locations?
If you complete a manual network search, do you get any networks showing as available? Does the SIM work in another handset (if you have one)? You can also check for area issues here regarding mobile coverage.
Rob