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I can't say for sure since I have Verizon, but text messages are prob not using packet data unless using Google voice, etc. In that case, if your phone is on and international roaming is enabled, texts would come thru. You'd need to call at&t to disable. However, Verizon is usually 5 cents for incoming texts and 50 cents to send internationally...if at&t is similar, that isn't to bad imo too receive.
I'd be more concerned with incoming voice calls - I remember reading a long time ago on tmo that if you pressed ignore on an incoming call while roaming, it would charge a minute for the call to come thru internationally, then another to route it to your voicemail. Think the only way to avoid this was to fwd to your voicemail before leaving US. Don't know at&t tho
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