Hey all, My wife and I are traveling to Hong Kong this week. I'm trying to prevent any issues with my phone once I get there, but I'm reading some conflicting posts. I have a 3GS with 3.1.2. Some folks say that I can just switch the "Data Roaming" to off, and I won't be charged with roaming. However, I've also read posts here that say this button does not work, and that I'll need to call ATT directly to have them shut off data roaming. When I checked with ATT, the CSR had no idea what "data roaming" was...so how do I ensure that I won't be charged with data, just turn off data altogether? Also, do I need to purchase a sim card once I get to Hong Kong?