New iPhone 12 won't switch on

Perform a Forced Restart on the phone. Follow the instructions very carefully, as this is a bit tricky. You may need to repeat this several times.

Force restart iPhone - Apple Support

There are only 2 possible results when you perform a Forced Restart:

1) The phone returns to normal operation.....or, if it doesn't.....

2) There is a hardware problem with the phone that will need attention at the Apple Store (make an appointment) or take the phone to an authorized Apple Service shop.

You can find a list of authorized service shops in your area using the link just below:

Find Locations

Hello,

Have a look at this article, it might help: If your iPhone won't turn on or is frozen - Apple Support

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Who did you purchase the iPhone 12 from? It has been discontinued by Apple.