Article

2014-03-11 Southeast Asia

Passengers' mobile phones ring but not answered

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Posted by Fred 2014-03-11 00:26|| || Front Page|| [7 views ] Top

#1 A ring-tone could [could] be possible if the crash took place over land. Over the water.... not so much.

Posted by Besoeker 2014-03-11 11:33|| 2014-03-11 11:33|| Front Page Top

#2 Some call services ring if you are logged into them, even if your phone isn't connected.

Posted by gorb 2014-03-11 13:54|| 2014-03-11 13:54|| Front Page Top

#3 I call my wifes cell phone daily. When she has it switched off I get a ringing indication followed by the voice response ... "please enjoy the music while your party is reached" ... followed by a request to leave a message.

Posted by irishrageboy 2014-03-11 15:19|| 2014-03-11 15:19|| Front Page Top

#4 If the phones are really ringing you can locate them from the Call Detail Logs of the telco to within a few feet.

Even without GPS it means the phones are still doing registration. To do that they sample the power/signal/strength of the various Base stations and choose to tell the best one they are there. When they do this they give the power/signal/strength of a large number of base stations and carriers to the selected base station. If it is to busy it will select one of the other stations from their list and tell the phone to listen to that one.

From the PS measurements alone on the base station and the known locations of the other base stations you can triangulate to the cell phone.

However, I expect they are not live and it's just the last known location of the phones being rung.

That said .. when 911 happened some co-workers (friends) put together some modified base stations as back packs and got a special flight to NYNY to look for survivors. They found lots of working phones but no people.

Posted by 3dc 2014-03-11 15:33|| 2014-03-11 15:33|| Front Page Top

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