adidaskid808 wrote:That's a better way to do it.
Since you're only using your phone with WiFi.overseas.TAKE THE SIM CARD OUT!!!
You really don't need to get that drastic. Putting the phone in airplane mode, then turning on wifi only will accomplish the same thing.
To the OP, though I'm not sure how to do it on your phone, yes turning data roaming off will prevent you from incurring data charges. Another option is to turn cellular data off or as suggested above, put the phone into airplane mode and only turn wifi on. Of course, with the phone in airplane mode, you won't be able to make or receive any calls or send/receive text messages.