Can I turn off data roaming on my iPhone?
No doubt you've heard horror stories about multi-thousand dollar bills iPhone owners have received from their service providers when going overseas and using the iPhone's data features on a foreign network. Many service providers are charging exorbitant fees to their customers for data roaming.
Luckily, with the introduction of iPhone firmware 1.1.1 there's a way to turn off data roaming so you can be sure you won't get shocked with a big bill.
Head to Settings -> General -> Network and turn data roaming to OFF.