iOS 15 due to too many bugs, the upgrade rate is very low, but recently Apple has done a relatively desperate thing, apple is currently promoting iOS 14 user updates, the current iOS 15 before all versions have stopped fixing, and iOS 15 update is no longer a footnote at the bottom of the "software update".
That said, Apple has already begun to force users to upgrade iOS 15.
In the past four years, iOS 15 has been installed on 72% of devices in the iPhone, compared with iOS 14 in the same period last year, which has already exceeded 80%
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![iOS 15 upgrade rate, unprecedented dismal, do you dare to update?[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)