I changed my phone number! So my iMessage and FaceTime is set up to my old number I have tried deregister on the website but I no longer have that number to receive the code BUT my iMessages still use it! WHY? How can I put my new number on iMessage?
You need to change the number on your Apple ID. After the change, allow up to 24 hours for the change to sync. Before trying to make the change, sign out of Messages/FaceTime on all devices/computers.
Did you get an error when you tried to activate? See If you get an error when trying to activate iMessage or FaceTime https://support.apple.com/en-us/HT201422.
Also see If you can't send or receive messages on your iPhone, iPad, or iPod touch https://support.apple.com/en-us/HT204065
Use these support options to get help if you need more.
Get a call from Apple support to help solve your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362
Apple ID Support https://support.apple.com/apple-id
Apple ID account security for country-specific and region-specific help
iMessage and facetime
