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
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