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    <p>I just Googled around and gathered info.</p> <p>According to <a href="http://www.telecomspace.com/messaging-ussd.html" rel="nofollow noreferrer">Unstructured Supplementary Services Data (USSD)</a>:</p> <blockquote> <p>Unstructured Supplementary Services Data (USSD) allows for the transmission of information via a GSM network. Contrasting with SMS, it offers real time connection during a session. A USSD message can be upto 182 alphanumeric characters in length. Unstructured Supplementary Service Data allows interactive services between a MS and applications hosted by the Mobile Operator. These messages are composed of digits and the #, * keys, and allow users to easily and quickly get information/access services from the Operator.</p> <p>USSD messages are simple to form and easy to send. User can directly enter the ussd string and press call to send the message. A typical USSD message starts with a * followed by digits which indicate an action to be performed or are parameters. Each group of numbers is separated by a *, and the message is terminated with a #. The USSD gateway in turn can interact with external applications based on the USSD command. This allows access to number of value added services via USSD.</p> </blockquote> <ul> <li>USSD works on all GSM handsets of Phase II or later.</li> </ul> <p>However, if you are writing <a href="http://discussion.forum.nokia.com/forum/showthread.php?t=145899" rel="nofollow noreferrer">Java MIDlet on a Nokia device, it does not work</a>.</p>
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