Option 1: Night Shift Settings

Step 1

Go to Settings -> Display & Brightness -> Night Shift. You will be in the area that allows you to schedule or manually turn on Night Shift. But DO NOT enable either, just make sure you are on this screen with both options disabled before moving on to Step 2.

Step 2

Hold the home button or use the “Hey Siri” phrase to activate Siri. Now tell Siri to enable Low Power mode.

Step 3.

Now, hit the Home button once to exit the Siri screen. You should be back in the Night Shift menu where you can now Manually Enable Night Shift. Just tap the slider to toggle it on. You Should see that Low Power Mode is still enabled as is Night Shift. SUCCESS!
When you leave the Night Shift Settings screen, you’ll notice that the Night Shift menu will be greyed out, but Night Shift is still enabled.

Option 2: Timeout Siri

This is the harder method of the two, but if you cannot get the above method to work, perhaps you will have a better shot at this one.

Step 1.

Go to Settings -> Battery to Enable Low Power Mode. 
Step 2.
Hold the home button or use the “Hey Siri” phrase to activate Siri. When enabled tell her to enable or turn on Night Shift. With Low Power Mode enabled, Siri will say, “In order to turn on Night Shift, I’ll have to turn off Low Power Mode. Shall I continue?”

Step 3.

Now here is where it starts getting tricky. In response to her questions, say “yes”. Now right before Siri can respond, tap the sleep/wake button on your iPhone. If timed correctly, you’ll hear Siri’s response beep as you screen goes black. This is all about timing. If you hit the sleep/wake button too soon, Siri will not have the chance to fulfill your request. If you wait too long to hit the sleep/wake button, Siri will disable Night Shift. So, it will take more than a handful of times to hit that sweet spot to enable both Low Power Mode and Night Shift.

Step 4.

If the above steps are done correctly you’ll unlock your iPhone and should see Low Power Mode and Night Shift enabled at the same time. So, if you screen temperature is lowered and your battery icon is still yellow, you have successfully beat the system.

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