MB eSIM MBIM ready state guidance

This topic provides guidance on the expected MBIM ready state for eSIM scenarios on Windows 10, version 1709 and later. Conforming to the correct ready state ensures that the OS handles all changes properly for that scenario.

Important

All scenarios and states in this topic assume that the eSIM capable card is mapped to the default executor, executor 0, and is powered ON.

Scenario	MBIM_MS_UICCSLOT_STATE	MBIM_SUBSCRIBER_READY_STATE
eSIM with MF only (no profiles)	MBIMMsUICCSlotStateActiveEsimNoProfiles	MBIMSubscriberReadyStateNoEsimProfile
eSIM with no enabled profiles	MBIMMsUICCSlotStateActiveEsimNoProfiles	MBIMSubscriberReadyStateNoEsimProfile
eSIM with profile enabled	MBIMMsUICCSlotStateActiveEsim	MBIMSubscriberReadyStateInitialized
eSIM in passthrough mode	MBIMMsUICCSlotStateActiveEsimNoProfiles	MBIMSubscriberReadyStateNotInitialized

When a change in both MBIM_MS_UICCSLOT_STATE and MBIM_SUBSCRIBER_READY_STATE is needed, the slot state change should precede the ready state change.

When enabling a new profile or switching between profiles, the ready state should have the following flow:

For more info about MBIM_MS_UICCSLOT_STATE, see the MBIM_MS_UICCSLOT_STATE table on MB Multi-SIM Operations (MBIM_CID_MS_SLOT_INFO_STATUS).

For more info about MBIM_SUBSCRIBER_READY_STATE, see Section 10.5.2.3 of the public USB MBIM standard.