[Q] No service. topic

Hi new to the phone itself. Rooted it, after doing the 4.4.4 AT&T update. Now I do have S-ON but I saw that CM11 could boot with it. I flashed gapps and rom of course, and everything booted up fine. My problem is I have no service. Sim card is new, and of course worked before flashing. What do I need to do in order to find my service? Any help would be kindly appreciated.