[Bigsmith]

Just to clarify -- the Sprint TP2 is unlocked out of the box for foreign SIM cards used outside the U.S. You can take it anywhere outside the US, pop in any foreign sim, prepaid or whatever, and it will work -- no unlocking by Sprint or anyone else needed.

The cmonex sim unlocker is used to make the Sprint TP2 work on U.S. GSM networks (AT&T and T-MO sims). Use of the Sprint TP2 on GSM inside the U.S. is completely unsupported by Sprint, in fact the Sprint TP2 is programmed to ignore GSM signals when the phone is in the U.S. regardless of what sim is installed -- so to make it work on U.S. GSM a different radio ROM (also furnished by cmonex) has to be flashed to the phone, in addition to the sim unlocker.

The Sprint-supplied SIM is solely for overseas use. After being activated, it allows you to roam on overseas GSM networks at Sprint's very expensive roaming rates (like $3 a minute). It has no function inside the U.S. and can't result in charges to your account while you are in the U.S.