My iphone don't want to let me send text messages. Send button don't work.

Hello j5r9h,

I would be concerned too if I was not able to send messages on my iPhone. I recommend reviewing the following article to troubleshoot issues with sending messages:

iOS: Troubleshooting Messages

http://support.apple.com/kb/ts2755

Thank you for using Apple Support Communities.

Best,

Sheila M.

Go to Settings>Messages>Show Subject Field and make sure it's set to Off.

Best of luck.