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14th October 2015
01:15pm BST

Switching this on stops your phone lighting up when you get a message and basically cuts out any visual effects, allowing your battery to last longer.
This is an option available to people using iOS9 and turning it on is pretty simple.
Simply select Settings, then Battery, then Low Power Mode and hopefully you'll see a noticeable difference in the life of your iPhone battery.
H/T Metro UK
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