Q: My number doesn't connect to my iMessage

Hi NicholeT,

To connect your phone number on your iPhone, I would tap on Settings > Messages > Send & Receive. Tap on your Apple ID and choose Sign Out. Restart the phone. Go back to Settings > Messages, and sign in again with your Apple ID. If that doesn't work, this article should be helpful

iOS and OS X: Link your phone number and Apple ID for use with FaceTime and iMessage - Apple Support