Unblocking your iPhone, also known as "unlocking" the phone, lets you use any carrier you want with the device, as long as you have a valid SIM card. This also means you can use your iPhone anywhere in the world, as most iPhones come programmed to work for one particular region. After unlocking your iPhone, make sure you do not automatically update your phone with iTunes. Doing so might disable the device.
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Things you need
Upgrade your iPhone with 2.2 software update. Open iTunes and download the 2.2 iTunes update. Back up your phone and make note of any particular programs or apps you don't want to lose.
Download Quickpwn from the Internet. This application will help you unblock your iPhone.
Plug the iPhone into your computer using the USB cord. Open Quickpwn and find your phone and the 2.2 update.
Install Cydia, another program that will help you unlock your phone. Go into the "Applications" file. Click "Options" and "Add Repository." Type in "http://apt9.yellowsn0w.com/."
Install yellowsn0w, which is the application repository you just added to the phone, by clicking the "Add" button.
Turn off the iPhone. Using a paper clip, pop the SIM card out of the iPhone and replace it with the new one you want to use. Turn the iPhone back on. It should now be unblocked.
Tips and warnings
- T-Mobile users must turn off 3G in the iPhone before switching cards.
- Disable PINs before you make the switch.
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