I cant send or receive messages. What's wrong?

[Robot-]

You need to elaborate as to what messages you can or can't do

[keith30]

It would help if you put in more details of the problems you are facing and what device your using, then someone may be able to help.

[Glenntech]

Along with the other posted answers
Are you getting error messages?
What are the notifications people sending messages to you get, do they get any error messages?

[mand55]

People receive my texts but I can't receive texts People send to me
I have a galaxy note 10