Granted it's not likely to appeal to everyone, especially students and the office-bound. But if you work in extreme conditions, the Sonim XP3 Sentinel mobile phone could be right for you.Come and have a good if you think you're hard enough - the XP3 can take it all. It can be dropped from two metres onto concrete, submerged in one metre of water for up to 30 minutes and operate in temperatures from -20 to +55 Celsius. It's also got a Gorilla glass screen, a unique keypad that's good to go with gloves or wet hands, 110 decibel speakers which can be heard over machinery or sirens and military-level MIL-810F certification for resistance to humidity, salt, shock and heat. Of course, this Mike Tyson of mobiles can't legislate for you leaving it in the local pub, but aside from that, it's pretty much guaranteed to serve you for weeks, months, even years to come.'No matter how harsh the situation, the Sonim XP3 Sentinel is the ultimate safety phone for Lone Workers in extreme environments,' said Bob Plaschke, CEO of Sonim Technologies. 'Featuring high performance GPS, dedicated emergency alarm buttons, and a 'man-down' motion sensor that can detect impact, tilt, free fall and no-movement, the Sonim XP3 Sentinel has been configured to work hand-in-glove with the advanced 24x7 monitoring services of our partners.'Other notable features include an emergency red button that uses the built-in GPS to track your whereabouts and presumably, send help, along with a long battery life and a 2-megapixel camera with LED flash. if you want one, see your local Sonim dealer.