iMessages activation error message on iPhone 12 Pro

Anyone able to fix iMessage activation error message with new iPhone 12 Pro activation? I ported my number from one carrier (Rogers) to another (Bell). So I’m using Bell’s new SIM card not my old Rogers SIM card. I get sms texts but not iMessage. I do see existing text strings but it’s via my email not cell number. I have waited 24 hrs, turned iMessage on and off multiple times, powered phone off and on, I’m connected to home wifi with strong signal, I’ve updated iOS...any suggestions other than returning the phone and pulling all of my hair out??