How to use Twitter on your Mobile Phone
First you need to activate your cell phone with Twitter I would also un-check the let people find me by my number

Text Messaging on Twitter
Setting up your phone allows you to:
- Send tweets with text messaging on your phone.
- Receive texts for DMs and the tweets from users you want to be notified about.
Clicking the phone icon on a users profile page or your followers page sets Tweet notifications for that user.
Twitter commands
Do more than Tweet! Send these commands to Twitter:
- FOLLOW username
- Start following a user
- UNFOLLOW username
- Stop following a user
- ON/OFF
- Turn all Tweet notifications on or off
- ON/OFF username
- Set Tweet notifications for a user on or off (you’ll still be following them even if you set it to off)
- GET username
- Shows you the latest tweet from any user
- RT username
- Retweet a user’s latest tweet
- FAV username
- Favorite a user’s latest tweet
- D username your-message
- Send a direct message to a user
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- You can also Visit m.twitter.com on your mobile device.
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- Happy Tweeting & if you get a change Text FOLLOW @getterdonegurus We’d be glad to follow back!
I love using my mobile with twitter works great to update people if the internet is down!
A few more things you may see people tweeting…RT = ReTweet#FF The # is a Hashtag
The FF = Follow Friday so if you see a #FF @getterdonegurus they are saying Hey follow this tweep!
The best place to find info on twitter lingo and the best practices of twitter id here http://support.twitter.com/entries/166337-the-twitter-glossary