This API is available on Firefox OS for internal applications only.
The navigator.mozMobileConnections property returns an array of MozMobileConnection objects, which you can use to get information about the current mobile voice and data connection states of the device.
Note: The syntax used to be window.navigator.mozMobileConnection, returning a single MozMobileConnection object, but this was updated in Firefox 1.3 due to the introduction of Multi-SIM support (Dual-SIM-Dual-Standby or DSDS).
Syntax
var mobileConnections = window.navigator.mozMobileConnections;
Value
navigator.mozMobileConnections returns an array of MozMobileConnection objects you can use to get information about the current mobile voice and data connection states of the device.
This object also includes ICC-related (SIM/RUIM card) functionalities.
Specification
Not part of any specification