PocketPCTx

I have the hw6515a which i recently recieved a brand new one from HP. i Just recently started using it because i was able to finally unlock it for T-mobile. i did this on my other 6515 and no problems on it whatsoever..but ever since they sent me this new one its been messing up..

Many of my friends, some have t-mobile, some have cingular, etc they all have problems recieving some of my txt msgs. some say they send me messages and i never have gotten them. any reason why this could be? would a hard reset solve this? i asked t-mobile about it and he said basically just take the sim card out and put it back in and see if that helps. well it doesn't and that was the only help he could offer to me. any suggestions on what to do from here?

i thought txt msgs were like an smtp and had to recieve a 3 way handshake(TCP) to send the message, basically making it failsafe for it to not reach the other person eventually..or at least sit on a server until it found my phone and then send it sucessfully..but not too sure. any suggestions are great! Thanks