How do I fix my frozen iPhone after forced restart?
what to do if my phone is still froze AFTER force restart ?
[Re-Titled by Moderator]
Make sure on the last step of the Force Restart you hold the side button for at least 20 seconds before the Apple Logo appears and you will want to ignore anything else that may come up on the screen during that time.
Force restart iPhone - Apple Support (AL)
Otherwise it will be a trip to the Apple Store.
