WiFi and Bluetooth connectivity
My iPhone XS Max won't let me turn on my WiFi at all and when I try to turn my Bluetooth in it shuts itself off.
iPhone XS Max
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If wi-fi and Bluetooth are both failing, then I would suspect a hardware problem. They are both in the same chip. I suggest you make a Genius Bar appointment at the nearest Apple Store to have the device examined by Apple. They will explain your options from there.