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ON A MAC:
You must first configure iTunes to permit the use of IPCC files. This only needs to be done once. To do this:
1. If iTunes is running, quit iTunes (Command + Q)
2. Open Terminal (Macintosh HD - Applications - Utilities - Terminal)
3. Type or copy/paste the following into the Terminal window, then press the RETURN key:
defaults write com.apple.iTunes carrier-testing -bool TRUE
4. Launch iTunes
To apply an IPCC file to an iPhone:
1. Click the iPhone in the DEVICES section on the left to select it
2. Hold the OPTION key and click the CHECK FOR UPDATE button on the Summary screen
3. Select the IPCC file to apply
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ON WINDOWS:
You must first configure iTunes to permit the use of IPCC files. This only needs to be done once. To do this:
1. If iTunes is running, quit iTunes (Alt + F4)
2. Click the Start button, then click Run
3. Type or copy/paste the following into the Run box, then press the ENTER or RETURN key:
"C

Program Files\iTunes\iTunes.exe" /setPrefInt carrier-testing 1
4. Launch iTunes
To apply an IPCC file to an iPhone:
1. Click the iPhone in the DEVICES section on the left to select it
2. Hold the SHIFT key and click the CHECK FOR UPDATE button on the Summary screen
3. Select the IPCC file to apply