My iPhone 6 has turned into a potato after iOS update

I can't click the phone application in order to make calls, listen to voicemails, and add contacts. It freezes my phone everytime I open it and then it crashes. My phone has slowed to exponentialy slow speeds, it freezes almost every 15 seconds when I'm using it, my battery drains from 100 percent to 10 percent within 30-45 minutes, it's ridiculous. I updated to iOS 11.2

Maybe you need to upgrade the phone.

Your problem lies within the phone battery. It has run out of juice. Go to an apple store to get a replacement.

It could be software [firmware] corruption, that happened to one of mine when it was only a few weeks old.
(A similar thing with fast drain, immediately after an IOS upgrade).

Back up the phone via itunes then do a "DFU Restore" - that is really a total "clean reinstall" of the operating system and will fix any firmware corruption caused by a messed-up system upgrade.
When it's finished, it starts up as if it were a new phone, though still tied to your apple account.

You can then restore the backup to get the phone data and apps back.

More info:
https://www.imore.com/...d-dfu-mode

My phone that had the same problem is still perfect, almost three years on from that.

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