i just transfer on t-mo last week.. well, everyone knows that t-mo coverage sucks.. but if u have coverage on 3G ... its not that bad... on at&t i can't watch video on youtube continously, but on 3g at t-mo i can..... my only concerned on t-mo.. is that the coverage really sucks... its so hard to get 3g connection.. thats all... but paying less and getting 3g connection.. i think its worth it to move from at&t to t-mo...