Sadly, I find it hard to believe that passengers wouldn't have tried to use cellphones, and I'm inclined to think that the cabin became depressurized before the

Sadly, I find it hard to believe that passengers wouldn't have tried to use cellphones, and I'm inclined to think that the cabin became depressurized before the last report of contact (a ping off of an inmarsat sattelite) which is reported as 7.5 hours after takeoff.