Hi there,
Though it may sound simple, there are a few tricks to try first.
Turn off your phone, pull out the battery and SIM card. Check your SIM contacts (little gold pieces on the bottom of the card) Are they clean? If not, wipe it off with a soft cloth. Now place the SIM card and battery back in and turn your phone back on.
I worked for AT&T customer service for a good long while and this is the very first thing they will request you to do.
Attempt to make a call - If it still doesn't work, you're going to need to call AT&T customer service as they have tools to push settings and much more. Generally if your phone is acting up it's because you've left it on 24/7 and it just needs a reboot.
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