iPhone 12 isn't working

If you want help directly from Apple, start here:

Genius Bar Reservation and Apple Support Options - Apple

However, if you provide the details here, you may find you get some very useful help from your fellow users.

This is a public forum. I have requested the mods remove your phone number. Please be careful in the future posting personal information here.

that said if you were already working with Apple on your issue you should continue working with them—we are all just users like you: https://getsupport.apple.com

Since you don’t say why your phone won’t work, it is difficult to offer any help. As noted, you may need to continue to work with Apple support. Have you contacted your carrier for help if it is a call related issue?