Unstructured Supplementary Services Data is referred to as USSD It is a technique that connects a mobile phone and an application on a mobile network to exchange data, typically text menus. One-time requests and menu-based interactive navigation are both possible with USSD codes. As it is supported by all handsets and networks and requires no internet to connect, it is incredibly effective when aiming for a lower LSM. As a result, it has a wide audience and is widely used in your market.