This instruction is for ios7 of Apple iphone:
1.Turn Data Roaming to OFF
Go to Settings - Cellular
Turn Data Roaming to OFF


When you switch you phone ON overseas, you will be prompted to switch Data Roaming ON. Please do not turn it ON leave it OFF.
If you choose to turn on data roaming, your phone will continue to check for emails and receive software updates and automatic notifications - all of which will incur a data charge.
2. Turn Location Services OFF
Go to Settings - Privacy - Location Services - Swipe to Turn OFF
3. Turning your email notification OFF while overseas
Go to Settings - Mail, Contacts, Calendars.
Scroll down and tap on 'Fetch New Data'. Swipe to turn push Off.
4. Turning OFF notifications from other apps (eg. facebook)
Turning off notifications from each app is recomended as it will continue to receive software updates and automatic notifications. The setting for each app is different. Here we are taking an example of facebook app.
Tap on facebook app - Tap on More - Tap on Account Settings - Tap on Notifications - Turn notifications OFF
Repeat this on each app.


