I am having a problem with my AT&T Blackberry Curve. I went to turn it on this morning and after tyhe usual amount of waiting, underneath the time on my phone it says "Initialization Failed" and won't let me make any calls or send any text messages. It will let me access the other features of the phone that don't use the network.

I tried taking out the battery and rebooting and got the same problem over and over. I took out my SIM card and rebooted and it said "Insert SIM Card"

Does anybody know a way to solve this problem?