Monday, September 29, 2014

Unstructured Supplementary Service Data

Unstructured Supplementary Service Data (USSD) is a protocol used by the GSM cellular phones to communicate with the service provider's computers.

USSD messages typically start with a * and has numbers and special characters in it. They do not have spaces and terminate with a #

Example:
a) *101#
b) *39489*234*349839#

Some operators use USSD to provide access to real-time updates from social-networking websites like Facebook and Twitter.[2] Wikipedia uses USSD to send articles to some feature phones.