Problem with activating iMessage and FaceTime

I have a problem with activating iMessage and Facetime on my iphone 12 mini. I am not able to activate my phone number so it can be used for both of those messaging and calling on facetime. I seem to be able to connect my Apple ID to both services, but even then it is not activating. Also, when i press add your phone number to imessage it keeps saying trying "verifying" no matter how many times i turn imessage on and off again, and therefore facetime. I have tried every single instruction i could find but it still doesnt work. What can i do? Is this a software problem? The phone is only 1 month old and it shouldnt have had any issues..