"Abiro Jitter (Java Twitter) is an easy-to-use and fully-featured Twitter client for mobile phones.

Benefits compared to using SMS to communicate with Twitter:

Less expensive than SMS (and especially so if you have a flatrate subscription), as information is sent over the data connection
Notifications don`t fill up your SMS Inbox
Support for more languages (actually any, provided the phone supports them)
More functionality, e.g. listing of timelines and users, as well as direct messages
More responsive
Jitter communicates directly with the Twitter server, increasing performance and reliability."