Okay last night my HTC One X , stop letting me receive && send text messages. So I turned my phone off and back on && now the At&t symbol doesn't appear in the top left corner... What happened ??? Can anyone help ?:'(
Go to your settings and make sure you didn't accidentally turn off the mobile network and check to make sure the network is still listed in the about/network setting. If it's not, then there is a problem.