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Funny, I have an XR and the ONLY upgrade option for me is the 11. I will be hunting myself.

So wish Apple gave options to theirs with PWM sensitivity.
 
They will be kept by Apple to use as exchange devices, plus carriers are still selling them as well as third party companies. They’ll likely buy apples remaining stock after Apple take what they need/want.
 
They go to carriers like AT&T. Those carriers sell low cost iPhones to customers who can't or prefer not to buy expensive models.
 
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