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The MultiSIM configuration service provider (CSP) is used by the enterprise to manage devices with dual SIM single active configuration. An enterprise can set policies on whether that user can switch between SIM slots, specify which slot is the default, and whether the slot is embedded. This CSP was added in Windows 10, version 1803.
The following diagram shows the MultiSIM configuration service provider in tree format.
./Device/Vendor/MSFT/MultiSIM Root node.
ModemID Node representing a Mobile Broadband Modem. The node name is the modem ID. Modem ID is a GUID without curly braces, with exception of "Embedded" which represents the embedded modem.
ModemID/Identifier Modem ID.
ModemID/IsEmbedded Indicates whether this modem is embedded or external.
ModemID/Slots Represents all SIM slots in the Modem.
ModemID/Slots/SlotID Node representing a SIM Slot. The node name is the Slot ID. SIM Slot ID format is "0", "1", etc., with exception of "Embedded" which represents the embedded Slot.
ModemID/Slots/SlotID/Identifier Slot ID.
ModemID/Slots/SlotID/IsEmbedded Indicates whether this Slot is embedded or a physical SIM slot.
ModemID/Slots/SlotID/IsSelected Indicates whether this Slot is selected or not.
ModemID/Slots/SlotID/State Slot state (Unknown = 0, OffEmpty = 1, Off = 2, Empty = 3, NotReady = 4, Active = 5, Error = 6, ActiveEsim = 7, ActiveEsimNoProfile = 8)
ModemID/Policies Policies associated with the Modem.
ModemID/Policies/SlotSelectionEnabled Determines whether the user is allowed to change slots in the Cellular settings UI. Default is true.