iOS 15.2.1 Bluetooth issue
Some reason Bluetooth not working right on iPhone 8
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Make sure that your Bluetooth accessory and iOS or iPadOS device are close to each other. Turn your Bluetooth accessory off and back on again. Make sure that your Bluetooth accessory is on and fully charged or connected to power. If your accessory uses batteries, see if they need to be replaced.
If you can't connect a Bluetooth accessory to your iPhone ...