How do I update my Twitter via cell phone?

Question From User - Answers in Comments.

I already set up my mobile account. I have gotten texts from Twitter, like verification codes and stuff. But I don't know how to update my own status via cell phone. I've sent my tweet to the right number, but it won't update. What is wrong?

It told me to send my updates to 40404. They send, but when I check my Twitter my status isn't updated.