How do you use twitter through text message?

[tinyhorse573]

I saw on twitter that you can use twitter through text messaging and stuff. How does it work and do people charge you for going on the internet? (if it does go)
Don't give me some stupid answer please like look it up or sumthing just to get points. Please be helpful.

[I am Bob]

Log on your twitter account
Go to Settings> Moblie> and follow the steps from there.
You use it like if you were sending a text but on twitter they give you a number to text it to.