jtwitter is a Java application that you install on your phone. It allows you to enter twitter updates using your phone without having to send SMS´s. It also allows you to view your timeline, friends timelines, public and featured timelines.
jtwitter only refreshes when you request it to. You can leave it on all the time without fear of running up data charges.
To download “jtwitter” to your phone visit http://www.jtwitter.com/wap using your phone web browser.