按：除了更新自己的twitter消息之外，手机短信还可以完成下面的功能：

1，接收推友的发给你的私人消息和你想跟踪的推友的推，你也可以关闭这些功能，我就关闭了这些功能，因为可能会收我的短信费，而且我没那么着急要跟踪什么消息；

2，直接给某推友发私信。

3，等等，原文附后。

附原文：

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.

•   OFF
•   ON

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