Phone is freezing since got it updated to ios15
Phone freezing due to new update any help
iPhone 7 Plus, iOS 15
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Make absolutely sure you are not running any App Store VPN or security apps. They most probably will not be compatible with iOS15
Force restart https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios
If no better
Backup and restore (using the computer method preferably)
(1)How to back up your iPhone, iPad, and iPod touch – Apple Support
Unlock your SIM PIN if it has one
(2) Restore your iPhone, iPad, or iPod to factory settings – Apple Support
(3) Restore your iPhone, iPad, or iPod touch from a backup
If the problem remains then arrange a repair