> 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:
> Is there any way to add money to the SIM here in the USA ?
Sure, he should check this: