Some iPhone XR owners are dealing with performance issues, connectivity issues, and other problems as we push away from the phone’s release date.

Apple’s cooking up a new version of iOS 12, but we don’t know when the iOS 12.1.1 update’s bug fixes will arrive. The update is currently in beta ahead of an unknown release date.

If you own an iPhone XR and you’re dealing with issues, you’re on your own for the time being.
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https://www.gottabemobile.com/iphone-xr-problems-fixes/