Data Roaming “OFF”
3G "Off"
Fetch New Data: "Off"
Utilize Wi-Fi instead of 3G/GPRS/EDGE:
Wi-Fi is available in many international airports, hotels and restaurants to browse the Web or check email.
Turn Data Roaming "OFF": By default, this setting for international data roaming will be in the "OFF" position.
To turn data roaming "ON/OFF", tap on Settings>General>Network>Data Roaming – Turning "OFF" data roaming blocks email, browsing, and downloads, but it will not block text or picture/video messages.
When abroad, international roaming rates apply when you send text or picture/video messages.
Turn Fetch New Data “OFF”: Check email and sync contacts and calendars manually instead of having the data pushed to your iPhone automatically. This way you can control the flow of data coming to your iPhone.
To turn off the Auto-Check functionality: tap on Settings>Mail, Contacts, Calendars>Fetch New Data, Change Push to “OFF” and Select to Fetch Manually
Reset the usage tracker to zero: When you arrive overseas access the usage tracker in the general settings menu and select reset statistics. This will enable you to track your estimated data usage. To reset Usage Tracker to Zero tap on Settings>General>Usage>Reset Statistics
Turn on call forwarding on my iPhone so that all calls go to voicemail: Settings-> Phone-> Call Forwarding-> On-> 321-> Click the "call Forwarding" button, and your done
To check your voicemail, simply call your phone, then interrupt the greeting by pressing * — the default password is your 7 digit mobile number (i.e. your number without area code), and you should set up a unique passcode for it as soon as possible. Call AT&T to have the password reset: 1-800-331-0500.
Also as a last resort: go into Settings -> Phone -> SIM PIN and turn it on. Restart your phone (power completely off and back on), and no data will go through the cell connection without you entering your SIM PIN
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