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.
If you've restored your mobile phone, you need to reactivate it. Once done, you can use your mobile phone again. Remember, you need to install iTunes on your computer before you can activate your mobile phone. You can download the program from www.itunes.com.
Start the program iTunes on your computer.
Tap and hold On/Off until your mobile phone is turned on.
If required, tap Unlock.
If required, key in your PIN and tap OK.
Connect the data cable to the socket at the bottom of your mobile phone and to your computer's USB port.
Follow the instructions on the screen to select the required synchronisation settings. Select Done. After a moment "iPhone sync is complete." is displayed and your mobile phone is ready for use.
