Install iOS 14 Beta If You're Having Problems
If your phone is really struggling on iOS 13, you might want to give the iOS 14 beta a shot.
The iOS 14 beta might cause problems for you, but there's also a chance your device's performance improves once it's on board.
iOS betas have been known to fix issues like severe battery drain, random reboots, connectivity problems, and user interface lag.
If you don't see a significant improvement, you can always drop back down to iOS 13.6. Again, you can't downgrade to anything older than that.
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