Multisim

MultiSIM refers to mobile devices and plans that support more than one SIM profile simultaneously, allowing the use of multiple phone numbers and network services on a single device. This can be achieved with multiple physical SIM slots, or a combination of physical SIMs and embedded SIMs (eSIM). In consumer devices, dual-SIM configurations are most common, with occasional triple- or quad-SIM setups. Many modern phones use one physical SIM and one eSIM, while others provide two physical slots or more.

How it works varies by device, but typically users designate a primary line for voice and data and assign data or calls to other profiles as needed. Some systems support simultaneous voice and data on multiple lines, while others require manual switching. eSIM provisioning is performed remotely via carrier apps or QR codes, enabling the activation of a profile without swapping physical cards.

Benefits include the ability to separate personal and work numbers on a single device, easier travel with local data plans, cost control through different carriers, and redundancy if one network is unavailable. MultiSIM can improve coverage and flexibility in business and personal contexts.

Challenges and considerations include potential impacts on battery life and device heat, software complexity, and the need for carrier and regional support. Not all carriers or markets fully support eSIM provisioning, and some devices limit simultaneous use of multiple profiles. Security considerations include the broader management of multiple SIMs and the risk of SIM-swapping; users should manage PINs and profile permissions carefully.

Standards and adoption are driven by the GSMA for eSIM specifications, with broad support from leading smartphone manufacturers and many mobile operators since the mid-2010s. Use cases span business travelers, households, and Internet of Things devices.