Always take a mobile communication device with you.. 
Good advice…
London: His cellphone saved him. Yes, a British skier, who slipped into a crevasse in the Swiss Alps, was saved from plunging nearly 700 feet to his death by his ‘Blackberry’ mobile phone.
David Fitzherbert’s half-inch wide mobile handset in his breast pocket caused him to get wedged in a crack of ice, stopping him from falling further. And, incredibly, the device still worked after keeping him stuck for almost two hours till he was rescued.
The 52-year-old finance worker was skiing off-piste down a glacier in the Matterhorn and Monterosa peaks in the Swiss Alps when the snow gave way.
“The snow gave way beneath me and I fell down a very deep crevasse. After 70 feet it narrowed and I became stuck like a cork in a bottle between the walls.
(Source)
