When you connect iPhone with your computer at the first time above iOS 7.0 version, you need "trust this computer" on iPhone. If you select Trust, the computer will be trusted indefinitely. And this computer will be listed in your iPhone trust list, an iPhone only supports 5 different computers. But if you select Don't Trust by mistake or your iPhone has authorized five computers before, your iPhone will be not recognized by the computer.
So how to remove or cancel the trusted computer on iPhone, there are two solutions.
1. Reset iTunes Alert setting
Open your iTunes and enter Preferences window, select "Advanced Preferences" section and click "Reset warnings" button. It only work for removing the trusted information for this single computer.
2. Reset all trusted state on iPhone
Open your iPhone->Settings->General->Reset->Reset Location & Privacy, it will cancel all the trust about your iPhone.
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