Device Guides

Apple iPhone 4

iOS5

iOS4

iOS is the operating system software installed on your iPhone. To find out which version you have: Tap Settings, Tap General, Tap About, and view the version number.

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How to

Restarting my mobile phone

Your mobile phone may not react due to overload or errors in the operating system. If this happens, it might help to restart your mobile phone.

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1. Restart your mobile phone

Tap and hold On/Off and the Home key.
Your mobile phone is turned off and after a moment it's turned on again.

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