This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
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.