Imessage not allowing me to send from phone number, only email address

i work offshore away from cell service but have wifi onboard. Recently, ive noticed my imessage send and receive is coming from my email and not my phone number. I go to settings, messages, send&receive and it has my phone number (with the spinning icon like its thinking) and the the check mark next to my email address. It also says waiting for activation under send and recieve. I am up to date on software, i've restarted the phone, logged out apple ID and logged back in, but still just shows my email checked and my phone number just sits there spinning. Any idea on what i need to do?