It is a set of functions residing on the Subscriber Identification Module (SIM) card that interacts with the cell system’s working system. Performance consists of companies comparable to stability inquiries, cell banking, info companies, and community configuration. For example, a person may entry a menu inside the telephone’s interface to test their pay as you go stability by way of the SIM, initiating a request despatched to the community operator.
Its significance lies in enabling cell community operators to offer value-added companies on to subscribers, impartial of the handset producer or working system. This offers a constant person expertise throughout a variety of units. In earlier cell communication eras, it was an important channel for delivering important companies and differentiating choices in aggressive markets.