Has anyone else had this problem?

I started getting slammed by a few friends for not replying to texts. Three specifically said I snubbed them. After getting a new SIM Card, even replacing my Blackberry 8800 (it had some other issues) I still wasn't getting texts from these friends. But I WAS getting texts from others, and my texts WERE getting out to them.

Any thoughts?

See More: Not Recieving Texts from AT&T