My iPhone is frozen
my phone is frozen and i can't open any apps or restart my phone
[Re-Titled by Moderator]
iPhone 11, iOS 15
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The article above should get you out of it if you go through all the stages.
If it doesn't then have it repaired
Article
If your iPhone won't turn on or is frozen
arrange a repair
https://support.apple.com/iphone/repair/service