I had a similar experience but didn't have to pay. AT&T's i18n data system (the whole thing) is a piece of junk. * I unlocked my phone (iphone4S), went to Asia

I had a similar experience but didn't have to pay. AT&T's i18n data system (the whole thing) is a piece of junk. * I unlocked my phone (iphone4S), went to Asia, and bought a SIM card for a local carrier. The SIM card didn't work because I had unlocked my phone the day before leaving, and AT&T claims they need 30 days to process unlock requests. * Fine. I bought AT&T's data roaming plan, and turned data on a few hours later once I confirmed AT&T had charged me. Data worked OK, though I couldn't get texts, and was therefore locked out of my work email which had text-based MFA. Alright. * I return to the US and promptly cancel the month-to-month i18n data plan. Phone behaves normally. * A full week after being back in the US, I get a text from AT&T saying my data is suspended for excess use. I call them (this is at 9pm and I'm trying to get dinner) and they drag me on for 45 minutes. Their system didn't recognize my i18n plan purchase and they wanted $700. Eventually they got an adjuster to drop the charge completely. Moral: even if you play AT&Ts games you'll still get burned. Request for Startup: a telecom customer service provider.