If you try accessing Twitter from the browser of a mobile phone, Twitter will automatically serve you the mobile-optimized version of their site. However, if in case Twitter fails to recognize your smartphone, you can manually type m.twitter.com to directly access the mobile site of Twitter from your phone. Now that's one way to use Twitter from your mobile phone. You also have a wide variety of mobile apps for Twitter that not only offer a much better experience than Twitter's mobile site but they also integrate with some of your phone functions like the built-in camera. Have a look!