> Our son is home (Chicago area) from Germany,
> and he has a German T-Mobile SIM card and a GSM phone.
>
> The phone freqs don't match up with USA freqs,
> so we moved the SIM to an old unlocked Blackberry 9000.
> It finds both the AT&T and T-Mobile GSM networks.
>
> The phone number on the SIM is listed as +491512xxxxxxx
Roaming is expensive:
<http://www.t-mobile.de/roaming/0,16674,20711-_,00.html>
> Is there any way to add money to the SIM here in the USA ?
Sure, he should check this:
<http://www.t-mobile.de/online-aufladen/0,21007,23900-_,00.html>