![]() If you want to learn more about preparing for major iOS upgrades, check out TMO’s iOS 4 Upgrade Guide. Just be sure to leave your iPhone or iPod touch connected to your computer until iTunes completely finishes the upgrade process. Upgrading your iPhone’s OS requires a reactivation process, which should be handled automatically by iTunes. ITunes can check for iOS updates with a button click. If a system software update is available, you’ll see a dialog that lets you download and install the update. ![]() ![]()
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