Updating itunes version
If you can’t update wirelessly on your i OS device, you can update manually using i Tunes on a computer that you trust.
If your computer is using Personal Hotspot on the i OS device that you’re updating, connect your computer to a different Wi-Fi or Ethernet network before you update.
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If you need more space for a wireless update, you can update using i Tunes or delete content manually from your device.
Whether you use i Tunes or update wirelessly, you'll have the same amount of free space on your device after you update.
On i Phone and i Pad, the i Tunes Store and App Store apps are updated automatically with system updates.
If you see an error message while trying to update your device wirelessly, learn what to do.