iPhone - Disable International Data Roaming – Edge
If you are traveling abroad and do no not want disable Edge so that you can avoid data roaming charges, here are instructions:
1. Settings > General
2. Network > Data roaming
3. OFF (When abroad, turning off Data roaming may avoid roaming charges when using email, web browsing and other data services.)
It works if you never see the [E] to the right of the AT&T logo.
When you return to the United States, make sure you re-enable it.