iPhone 8 and iPhone 8 Plus owners are dealing with numerous problems including Bluetooth issues, sound problems, and various issues with the device setup.

iPhone 8 users are reporting issues with their hardware and the iOS 11 software that powers the two devices. We expect the list of problems to grow as more people buy the iPhone 8 and as Apple releases additional firmware updates throughout the year.
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https://www.gottabemobile.com/iphone-8-problems-5-things-you-need-to-know/