How to enable EDGE / 3G with custom APN information.
If you have an unlocked iPhone and would like to use cellular internet access on the network of a carrier that is not the one who originally sold the iPhone, and you know the APN address, username and password, please follow the instructions.
1. On your iPhone, in Safari, open the address : http://www.disable3g.com.

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

3. On the welcome screen, tap 'Enter Custom Information'.

4. Fill-in the information and tap 'Install'.

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

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

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

That's it, you have successfully enabled cellular internet access on your iPhone via EDGE or 3G. NOTE: Check cellular internet access rates with your carrier. It can be very expensive if you don't have a data plan.
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 - Enable 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.
