How to disable EDGE / 3G
To completely disable cellular internet access via EDGE or 3G on your iPhone, please follow these instructions.
1. On your iPhone, in Safari, open the address : http://www.disable3g.com.

2. When asked, enter your unique access code and tap 'Go'.

3. On the welcome screen, tap 'Disable EDGE/3G'.

4. A new window will pop-up, tap 'Install'.

5. A confirmation box will pop-up, tap 'Install Now'.

6. When it is done installing, tap 'Done'.

That's it, you have completely blocked cellular internet access on your iPhone. You can still use Wi-Fi to access the internet.
To go back to your original settings
1. On the home screen on your iPhone, tap 'Settings'.
2. When the Settings window has opened, tap 'General'.

3. On the 'General' settings window, scroll down to the bottom and tap 'Profile - Disable EDGE / 3G'.

4. The details will be displayed. Tap 'Remove'.

5. A confirmation box will pop-up, tap 'Remove'.

That's it, you have returned your iPhone to its original EDGE / 3G settings.
