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Helpful answers
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Oct 27, 2015 8:09 PM in response to NYChrissyby Carolyn Samit,"using my home internet connection"
Restart your internet modem and Wi-Fi router.
"The phone restarts randomly throughout the night"
Help here > If your iOS device restarts or displays the Apple logo unexpectedly
"The slide to answer doesn't work when trying to answer a call on the locked screen."
When that happens, force restart your iPhone. Press and hold both the Sleep/Wake and Home buttons for at least ten seconds, until you see the Apple log.
It's not possible to revert to a previous iOS version.