During my occasional rounds of the websites for the various SIMs I have I saw this at
Piranha Mobile:
Quote:
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For AT&T** Roaming: Login into your online account, change your roaming profile to “AT&T profile USA “ and then reboot your handset.
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But wait! There's more: [edited for relevance---sorry, unabable to format neatly. ]
- Calling a: Mobile Currency: American Dollar Calling From: United States Calling To: United States
- Piranha Roaming on Make Call/ Receive call/ Send SMS/ Voicemail / Data Per MB
- T-Mobile 0.14/ 0.09/ 0.15/ 0.11/ 0.38/
- AT&T** 0.30/ 0.23/ 0.23/ 0.27/ 0.15/
So, making calls, receiving calls, sending SMSs and voicemail is more expensive. BUT data is cheaper. It also does 3G with AT&T and I know of no international SIM card that does 3G on AT&T. Double bonus.