Got hacked, Have to reset phone everyday

You have a pretty old iPhone and what your describing is hardly a reason to believe you've been hacked. And to be hacked, you'd have to have given your phone to someone for a few hours, who would have to have installed software on your phone, none of which likely happened.

iPhone 7 has a history of having cellular connectivity issues. There is or at least was a program for such issues.

See if by chance your phone qualifies --> iPhone 7 Repair Program for "No Service" Issues - Apple Support

Given iPhone 7 is no longer eligible to be updated to the newest iOS version, it really would be a good time to consider upgrading to a newer, more modern iPhone at this point.

If you did not jailbreak your phone, it has not been “hacked”.

Try actually describing your problem.