Is it worth it?

[dan1]

Im sure this has been asked many times but I cant seem to find an answer! Im thinking of buying the 3GS from o2 but plan to use a t-mobile sim....how would I go about unlocking it? Would the phone work as it should when unlocked....basically is there any point buy a phone just to use another sim in it? Thanks

[i.Annie]

Yeah the iPhone is worth having on any carrier.