This functionality allows users to manage and configure the Subscriber Identity Module (SIM) cards within an Android operating system. It enables options to choose a preferred SIM for calls, messages, and data, especially in dual-SIM devices. For instance, a user might designate SIM 1 for business calls and SIM 2 for personal data usage to optimize costs.
The implementation of this system is crucial in regions where dual-SIM phones are prevalent, offering increased flexibility and control over mobile communication expenses. Its existence has evolved alongside the increasing global adoption of multi-SIM devices, providing essential convenience and cost management capabilities. This feature streamlines communication management, adapting to varied user requirements and ensuring optimal resource allocation across multiple subscriptions.