While you would expect that when you hear a ring tone the phone is on and in working order that may not actually be the case - according to one expert.
"That does not mean the phone you are calling is ringing yet," wireless analyst Jeff Kagan told NBC News.
"The network is searching for the phone. First based on where it last was, then it expands. Then if the network can't find the phone, the call terminates."
Apparently even if the phone in question is in airplane mode - or is off or terminally broken - it may still ring on the caller's end, despite there technic