Not a question but a solution: after 1 week spent with apple support to solve the issue after multiple attempts, it just takes a NETWORK setting reset to solve the problem related to the impossibility of using iMessage/Facetime with the phone number after switching the provider but maintaining the same number
iPhone 12 Pro, iOS 15
It is part of the solution and glad it helped.
For the full process:
How to swap SIM card for a new provider
If you change numbers, or are using a temporary number pending porting, make sure both numbers are in the security section of your AppleID.apple.com account as trusted numbers before starting.
You then need to do this:
Settings, Messages, Turn off iMessage
Settings, Face Time, Turn off Face Time
Swap SIM cards
If changing providers, reset network settings.
Settings, Messages, Turn on iMessage, SMS, MMS
Settings, Face Time, Turn on Face Time
It is part of the solution and glad it helped.
For the full process:
How to swap SIM card for a new provider
If you change numbers, or are using a temporary number pending porting, make sure both numbers are in the security section of your AppleID.apple.com account as trusted numbers before starting.
You then need to do this:
Settings, Messages, Turn off iMessage
Settings, Face Time, Turn off Face Time
Swap SIM cards
If changing providers, reset network settings.
Settings, Messages, Turn on iMessage, SMS, MMS
Settings, Face Time, Turn on Face Time
thank you!!
You're welcome
Switching network provider and having iMessage problems
