Changes

Currently B2G supports a single SIM architecture. This proposal wants to extend it for supporting multi-SIMs. In multi-SIM device, each service is independent and has it own status and information. Here, we introduce a central 'nsIDOMMozMobileConnectionManager' to manage several multiple nsIDOMMozMobileConnection objectsarchitecture. One nsIDOMMozMobileConnection object is binded to a physical SIM slotservice. nsIDOMMozMobileConnectionManager will handle the interactive and synchronizing functions between nsIDOMMozMobileConnection objects in the future. For example, when data connection via SIM1 is no longer available, nsIDOMMobileConnectionManager will establish data connection via SIM2 for upper layersYou can use serviceId as index to get corresponding service object.

Following are what we create for nsIDOMMozMobileConnectionManagerThe change is quite simple, navigator.  interface nsIDOMMozMobileConnectionManager : nsISupports { readonly attribute jsval mobileConnections; readonly attribute mozMobileConnection becomes an array of nsIDOMMozMobileConnection defaultMobileConnection; };obect. API users can use 'serviceId' as an index to access corresponding service object.

// Listen connection status of default SIM slot var conn = window.navigator.mozMobileConnectionManager.defaultMobileConnection;  // Listen connection status of for specific SIM slotservice var conn = window.navigator.mozMobileConnectionManager.MobileConnectionsmozMobileConnection[indexserviceId];