It was possible to turn on both Night
Shift Mode and Low Power Mode at the same time using Siri before the release of
iOS 9.3.1. But when Apple released iOS 9.3.1, it fixed that. You could only
enable one feature at a time.
Step 1: Go to Settings – Battery – Turn on Low Power Mode  Step 2: Invoke Siri and say “Enable Night Shift Mode” Siri will reply like this “In order to turn on Night Shift,...
But a new way has been found to enable
both Night Shift and Low Power Mode at the same time on iOS 9.3.1. So if you’d
like to turn on both features at the same time, follow these steps:
Step 1: Go to Settings – Battery – Turn on
Low Power Mode
Step 2: Invoke Siri and say “Enable
Night Shift Mode”
Siri will reply like this “In order to
turn on Night Shift, I’ll have to turn off Low Power Mode. Shall I continue?”
Step 3: Say “Yess” and quickly press the
Sleep/wake button of your iPhone before Siri replies anything.
Step 4: Now Unlock your device and you
shall see Night Shift and Low Power Turned on at the same time.
This is little bit tricky, so do it 2-3 times
to make it work correctly.

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