Phone number in iMessages can't be activated
As many have written before, I also have trouble syncing my phone number to my imessage and facetime. a week ago I got a new phone, used but factory reset and as I was setting it up, the iMessages i sent were not connected to my phone number but my email that i use as my Apple ID. I've tried so many possible solutions and none helped. I've restarted my phone atleast a million times, reset the network info etc. I've even been to my network provider to see if they could help and none of the suggested actions worked. The furthest i've gotten was the 'waiting for activation' notice but when the number loaded it sent an error right after confirming the notice for extra charges for iMessage and facetime. Today I went and updated to a new sim card and now the number won't even show up anymore. Tried everything once again all over again and nothing worked. So far no one has been able to help me solve this problem. I just want to be able to send iMessages and facetime people without them getting a message from my email adress:/ Please someone help me fix this.
[Re-Titled by Moderator]
iPhone 12 mini