Phone Stuck as Unable to Install "app name"

I can't access anything on my iphone 12 as the screen just keeps showing the "Unable to install app, please try again later" message. I hit the "ok" button and it just reverts back to the message again. I can't get the control panel, can't turn it off, can't get back to main screen. Please, any suggestions greatly appreciated as phone completely useless now.

Replies

force restart it by: Press and quickly release the volume up button. Press and quickly release the volume down button. Press and hold the side button. When the Apple logo appears, release the side button.

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