A set of applications residing on the Subscriber Identity Module (SIM) card interacts with the mobile device’s operating system. This functionality enables service providers to offer value-added services directly to the user. Examples of these services include mobile banking, information services such as weather updates or news alerts, and promotional offers sent by the network operator.
The presence of these applications allows network operators to customize the user experience and provide specific services tailored to their subscribers. This capability was particularly relevant in earlier generations of mobile technology where application ecosystems were not as prevalent. Historically, it provided a method for pushing interactive services and content to users before the widespread adoption of app stores.