I GOT A CALL FROM THIS NUMBER TODAY BUT I NEVER ANSWER STRANGE NUMBERS. I GOOGLED THE NUMBER AND CAME UP WITH THIS:
FYI ... AT&T Survey Scam: I received a call yesterday from a guy saying he was calling from AT&T and asked me to take a 3 question survey in exchange for 30% off my next 3 bills. The number calling my phone showed up as the AT&T Customer Care center (1-800-331-0500), but it wasn't AT&T. It turned out that he hacked my iphone's SIM Card # and an hour later it cut off my phone from service. Around the same time I called AT&T from another phone and they were baffled that someone was able to get in and change my SIM card number in my actual phone, without it showing in their records ... usually someone has to call in and change it with them, pretending to be you. AT&T was Very helpful looking into the issue and I went to a store and they quickly replaced my SIM card.
Be Aware of anyone calling for a survey ... hopefully it won't happen to anyone else!