Last (probably stupid) question - it seems to be that all the offers I see are either for 'data' SIMs or 'talk' SIMs. On some sites, no matter how much I looked, I couldn't find ANYTHING on minutes/rates for voice calls but *everything* I needed on the rates for data.

Am I missing something here? Although I'm a Sprint customer here in the US (CDMA), the AT&T folks are GSM and their plans include voice and data on their SIM cards.