Netx Unstructured Supplementary Services Data (USSD) is Interactive menu Driven allowing operators to provide fast and responsive services. USSD support is present across all GSM and UMTS terminals (even the most basic).
Unstructured Supplementary Services Data (USSD) works on all existing GSM mobile phones.
Turnaround response times for interactive applications are shorter for USSD than SMS because of the session-based feature of USSD, and because it is NOT a store and forward service