on 03-08-2013 18:13
I'd go with turning off 3g and mobile data and use wifi where you can.
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on 04-08-2013 10:01
Depending on where you're going, apart from some hotels, most WiFi is free, if you can find it. If you really need to use your phone you can always get a local PAYG sim for the time you're away. Just make sure your phone is unlocked before you go.