Why didn't missing Malaysian jet passengers use their cell phones?
Phone records under investigation
"Malaysia Airline chief executive Ahmad Jauhari Yahya said on Monday there was no evidence of any attempt by the people on board to make calls, but he added that "millions of records" needed to be processed. "
"For mobile phones to be used, there must be a contact between the handset and the network - known as a "handshake". This requires a strong enough signal from both a transmission tower and the phone."
"Even if nobody on board the plane tried to make a call, logs of the "handshakes" might provide some clues about the route taken by the jet after it disappeared."
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