The small, removable integrated circuit, typically referred to as a subscriber identity module, stores information that identifies and authenticates a mobile network subscriber. It enables a device to connect to a cellular network. For example, transferring this module from a phone operating on the Android platform to one running iOS allows the new device to utilize the previous phone’s cellular plan and phone number.
The ability to move the module provides flexibility for users upgrading or switching between different types of mobile devices. Historically, this required contacting a mobile carrier to activate service on a new device, but the advent of easily transferable modules has simplified the process considerably. This benefits users by offering a seamless transition and avoiding the need to obtain a new phone number or contract.
