Hi, I'm on a pay monthly iPhone contract with 02 in the UK. If I travel abroad, and turn data roaming off, I presume I wont get hit with any data charges. I'm just wondering what wont work if I turn data roaming off - what wont work? I use between 50MB and 60MB a month usually (excluding WiFi), but I will cut right back when I'm on holiday. Obviously I cant browse the web or check emails, but will GPS work? So if I do want to use data I'll turn data roaming on, and use data from my 10MB allocation from the £20 bolt on. (Don't really want to pay £6 per 1MB on the standard tariff) Thanks for any views.