This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
signalStrength is a read-only property that gives the signal strength in dBm.
var dataMCC = navigator.mozMobileConnection.data.signalStrength; var voiceMCC = navigator.mozMobileConnection.voice.signalStrength;
Return a number.
This property can also be
null if there is no signal at all.
Not part of any specification.