Reply & Don't Reply

The other day my friend and I were talking about replying SMS. Check out the conversation :

Friend : If they don't reply means they think we are not important to them
Jason : Yeah quite true. At times the reply don't need 2 be essay but jz a Yes or No will do.
Friend : Yeah that is right.

I agree that its just like an acknowledgment when you reply people. When you don't its like what ever with them or to them and that they are not important. It also depends a lot on that person. Some people just don't reply at times. Sometimes people don't have credit (prepaid), but I guess most people are using line as it is cheaper than prepaid. (a little off topic)