How I fixed the SMS on my iPhone
So this all started with my previous post, the one about the HiPhone on the way to my house.
Well it came (no I haven’t done the review yet), popped the SIM out of my iPhone and popped it into the HiPhone to play with it.
I put in the settings for SMS, WAP, etc… but it was late so I took the SIM back out, put it back in the iPhone and crashed.
The next morning I went to send an SMS from the iPhone, everything looked good, but the recipient never got it. I tried multiple people on multiple services and none of them got it either, I could get SMS but not send.
I went on the AT&T online support line and they basically just pointed my to an Apple iPhone troubleshooting page. I tried all the suggestions there, including a hard reset, and nothing worked.
I called them back today and got an Apple guy, 45 minutes later he transferred me to an AT&T rep, about 20 minutes later she transferred me to a tech support rep, about 20 - 30 minutes later she told me to take it to an AT&T store.
Frustrated I asked her to give me the SMS Message Center Number… I won’t list it here ’cause if it doesn’t work for you I don’t want to be responsible for hosing your device. Just call support and they should freely give it to you.
I did a little searching on Google and found the code to put that number into the phone. I did a reset and… bingo, I was back in business! 
Call tech support for the Message Center Number, once you get it use this code on your iPhone:
*5005*7672*+NNNNNNNNNNN# - NNNNNNNNNNN = the message center number.
That got it working for me, HTH!
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when u say use this code in your phone, where exactly do you use it? do you dial it or what?
Call tech support for the Message Center Number, once you get it use this code on your iPhone:
*5005*7672* NNNNNNNNNNN# - NNNNNNNNNNN = the message center number.