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You can check for available software updates for your phone and download them. Follow these instructions to update your phone's software.
Before you can update the phone software, you need to install the program iTunes on your computer.
It's also recommended that you back up the phone memory. Click here for information on how to back up the phone memory.
Connect phone and computer
Update the phone software
Select your phone on the list of connected devices.
Follow the instructions on the screen to update the phone software.
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