"Hacked" is the wrong word here. Your phone is running a custom ROM. First question is Did you flash that ROM, or did you receive the phone with that already on it? If you did it yourself, then a flash back to the stock ROM will probably fix the issue.
A lot of ROMS in their early stages will have bugs such as LTE not working, the camera not working, MMS messages not working, or even missing the ability to make calls at all.
If you did flash a custom ROM on your phone maybe try a different one, or just switch back to stock.
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