Most of us are annoyed by the fact that iTunes automatically begins syncing content from iPhone, iPad or iPod touch as soon as the device is connected to the computer. This is a big dilemma. Therefore in this tutorial we'll teach you how to disable automatic iTunes syncing after connecting an iOS device to the computer.
1. Launch iTunes on your computer
2. Open Preferences from the menu on top
3. Check the box corresponding to "Prevent iPods, iPhones, and iPads from syncing automatically"
4. Click on OK.
That is all you need to do to disable automatic iTunes syncing after connecting iPhone, iPad or iPod touch to the computer. Please note that it is not necessary to connect your device to iTunes in order to disable automatic syncing feature. It can very well be done without the device. The next time you connect your iOS device to iTunes, rest assured it won't start syncing on it's own.