The past few days, I've been having issues sending and receiving texts. All would seem to be well, except people wouldn't be receiving some and vice versa. MMS also randomly started working at one point (Have a modified carrier file.) To test it wasn't my jailbroken phone causing problems, i switched SIM cards. I still had the same problem. I also went to "reset Network Settings." This re-disabled MMS, and it's still not working right. So I decided to call AT&T. They said it would be a two minute wait. I waited nearly ten minutes before someone answered. I told her the situation. I was put on hold for five minutes to be told I'm being transferred to somebody else. This guy has me send a text to 151 saying "Test." I got a response from AT&T saying my text messaging was working fine. He doesn't know what to do now, so he wants me to KEEP A LOG of texts I send, who they're to, whether they get them or not, and vice versa. What does he expect me to do? Call everybody I text to see if they received my messages and ask what they've sent me to see if I got them? This is ridiculous. So... Since AT&T is no help, anybody have any advice to help me out? Thanks.