So I switched to ATT from Alltel yesterday, I have yet to get my number ported over, but I don't think that is going to make any difference with my problem. I send messages to other people using Alltel and the get my message, but I don't get their response. I do get responses from ATT and Centennial users. I'm not sure if this is somthing wrong with ATT or Alltel or what. Is anyone else having this issue?