Hi I’ve got the same unresponsive glitchy screen issues as well. Downloaded the official iOS 15 release. 24 hours later had issues. The left side of the screen does not work and struggling to use phone at all. Restarted the phone multiple times but no luck. My phone is currently unusable - this is the third time I tried to write this message. Earlier today I purchased something on a site through the weird glitching screen issue!