A friend of mine bought an iPhone 4 outside the Philippines and used a postpaid SIM on it. After a month of use, which included casual internet surfing and downloading a few apps from the Apple App Store, she was shocked when she discovered that her bill reached Php5,000. She then discovered that her iPhone’s internet connection was on the whole time even if 3G was off. It turns out that her phone was still connected to the internet via cellular data network.
1. Go to the iPhone’s “Settings” icon and open the “General” tab. Then select the “Network” button.
2. Turn off “Enable 3G” and “Cellular Data” buttons. Then click on “Cellular Data Network”.
3. Under the APN for both “Cellular Data” and “MMS”, put a number after the “.ph” extension. Any number will do.
4. Press the “Home” button after doing the foregoing steps.
That’s it. This will prevent your iPhone from connecting to the internet via cellular network connection.