In Reply to: I phone Question re;sim card posted by santika on Tuesday, 6. April 2010 at 06:36 Bali Time:
If so, it will be fine
if not, then it won't - most iPhones are locked to the selling carrier when sold, they then need to be unlocked before u can use them on another carrier.
If wanting to use data, do a search on the forums, I asked a question about the data settings a few months back and got the details.