Very true. I have used AT&T phones (Iphone 3Gs and I897) in Korea, Japan, Haiti, Iraq, Kuwait, Germany, Ireland. Although it is quite expensive for international data/ voice, text is not too bad for a few messages until you can find a wifi connection.
Bricked my Captivate, so now running GS2 in Iraq with local sim. Data works with AT&T APN but too expensive. So for now only wifi connection. Found a great use for my Iphone.....Alarmclock!!
Touch 3.1 ROM + Launcher Pro Plus
SpeedMod K1-T10 Kernel