I couldn't receive texts from AT&T customers because something went wrong with the number porting process when I switched from AT&T to verizon. Odd thing was, it worked fine at first, but eventually I could no longer receive texts from AT&T. I was on the phone with Verizon for at least an hour while they tried all kinds of things. Finally they generated a trouble ticket. About four days later I got a text message from Verizon saying they fixed the issue. Indeed they did - it works fine now.