On Fri, 07 Mar 2008 11:16:14 -0500, "Percival P. Cassidy"
<nobody@notmyISP.net> wrote this with the utmost thought:

>I have the unlock code T-Mobile sent so our son can use his phone with
>prepaid SIM cards when he's overseas on a study program.
>
>Do we enter that code now to unlock the phone, or does he have to wait
>until he has the "foreign" SIM card? Some Web sites seem to say that the
>"foreign" SIM card has to be in place first. And if that is so, does it
>unlock the phone only for that specific SIM card?
>
>Perce

Put any other SIM in the 'phone and then enter the code when prompted. Try
and make sure it's a SIM from another network as other T-Mobile SIMS
won't/may not ask for the code.