Thanks...talked to Tmobil and what I was told was 3g phones software and hardware do not allow for dynamic IP changes....but all the new 4g phones do. So it seems on 3g you are stuck with a Static IP.
Thanks for the replies...For right now I just am going to go with forcing IP changes by changing my router mac address and use comcast...and continue to work on wireless Ip...so there are always backups ready.
Don't mean to bump old thread, but I am also running into this problem lately. I use to be-able to change my ip just by turning data off and on on my Galaxy S II but now recently, i haven't been able to change my ip address at all, not even by rebooting the phone. Is ip address on t-mobile static now?