How To: Save Battery on iOS Device

This tip may come off as odd since it's been understood that 'Airplane Mode' cuts off all wireless activity. On the contrary, it still allows the use of Wi-Fi and/or Bluetooth on any iOS device i.e. iPod Touch, iPad and iPhone. It will more than double the battery life of the iOS device. Use it on any generation iPod Touch and (Wi-Fi only) iPads.

The reason being, the iPod Touch and iPad (Wi-Fi only) do not use cellular data. If you happen to already use your iPhone as an iPod Touch and not as a phone then this will work as well. 

1. Select Settings
2. Switch Airplane Mode 'ON'
3. Proceed to turn on Wi-Fi and/or Bluetooth. Both will still function while Airplane mode in 'ON'.

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Source: support.apple.com