You should already turn off the data access on your phone BEFORE you go overseas.

I know of some people who only turn the data access off after they reach another country, but by then some background apps would already start running once the phone is registered to a network.

Turn off Mobile Data and Data Roaming, and as an added precaution, ask your telco if it's possible to completely disable Data Roaming.

This post has been edited by RDoe: Jul 22 2015, 09:37 AM