Iphone 10 is stuck powering up and I don't have my computer available to restart
How can you restart the iPhone 10 when stuck powering up? I do not have a computer to plug it into.
iPhone XS, iOS 13
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First try a forced restart
https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios
If that doesn’t work you’ll have to borrow a computer.
see the process below. Work all through it.
If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support
There is no guarantee you can save any data since your last backup