Q: My number isn't working with my phone and chat bubble is green instead of blue what should I do

If you are unable to use the phone with your phone number, you can try to remove the SIM, wipe it clean and then insert it again. If you still have trouble, contact your carrier. Phone service is a carrier responsibility. See this support document if you are having trouble activating FaceTime. If you get an error when trying to activate iMessage or FaceTime - Apple Support