Orange Roaming SIM card with T-Mobile

Posted by sfaguy
Hello,

I recently returned from HK where I purchased a couple of Orange international roaming SIM cards.

I have T-Mobile in California. I inserted the Orange SIM card and I can select either Cingluar or AT&T Wireless network. I follow the instructions to check my credit balance and to dial, but i get some kind of message saying unable to make the call.

Does anyone knows if T-Mobile even supports international roaming SIM card? Or has anyone able to use any other SIM card outside of the US (other than Cingular, AT&T..etc).

Thanks,
joE