iPhone SE Carrier Error

So this iPhone SE (Model MMX53LL/A) doesn't want to connect to Cellular. In cellular settings it states (Used as primary“ When I click that it states (Turn On This Line) When I click to turn the option on nothing happens and when I exit the setting or app it resets the option. I ejected the SIM card and put in back in (same issue) reset the phone (same issue) Anyone got ideas? Edit: Also now the phone is switching from SOS only to No SIM back and forth and also there is still a SIM card in there

[Edited by Moderator]