In Reply to: iPhone posted by Nicki on Saturday, 4. February 2012 at 15:41 Bali Time:
stuff like email push (you can set it to fetch email when you check your email only). Also location services - off. Basically anything that automatically goes and uses data to do stuff for you. You don't need it on holiday, just use it when you really want to.
First time I took my iphone to Indo, I ate up 50K in credit overnight as all my work emails were automatically retrieved. I deactivated the account the next time so that it didn't even try to get them when I checked other email account.