I am going to Asia tomorrow and want to use the phone but I need to turn the data off so no e-mails etc would be pulled ( downloaded ) so I dont need to pay a big bill...last time I thought I did... but of course I didnt... ended up a $700 invoice
When I went to jamacia I set it off while roming and shut it off with att to double check. 2 min call when I got back to the states and turned it back on.