Cannot call or text please help!!!

I can off skydragon and went to resurrection remix marahmellow ROM which is cm13 based. I love the ROM my phone has been running really fast and smooth. I having a problem that I cannot seem to fix. I cannot call out or in or text even though my phone indicates I have service. My LTE 4g data works awesome. Although if I switch my network mode to LTE/CDMA/evdo I can can call and text no problems but my phone favors 3g and will never connect to LTE which is a huge annoyance. I have wiped completely and did clean install of various marshmallow cm based ROMs with no luck. I have tried various modems and currently on 35b

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