Why are my imessages turning green and not sending?

Official_Apple_User wrote:

I have an iPhone XS, and since this morning my iMessage hasn’t been working. When ever I send a text it turns green even though the people I am texting also have IOS. They don’t even revive the message. My internet is working fine, and other than this problem my phone works perfectly fine. What do I do?

read here Why are my iPhone messages green? - Apple Support