Sometimes a stylish touchscreen just doesn't fit the bill - if you happen to be in construction, forestry or any job that involves hard graft and possibly working alone, the Sonim XP3 Sentinel is probably a better option.As you might expect, it's tough. It can be dropped from 2 metres onto concrete, submerged in one metre of water for up to 30 minutes and operate in temperatures from -20 to +55 Celsius. So for a building site in Newcastle, probably perfect. It also has a Gorilla glass screen and meets the military-level MIL-810F certification for resistance to humidity, salt, shock and heat. You can even use the keypad in gloves, while the speakers can be heard over machinery or sirens. Like we said, it's seriously tough.If you are working alone, you might also appreciate the red, amber and green alarm buttons, which send out requests for help or monitoring via GPS, while a long battery life keeps that GPS tracking going for 24 hours. Other features? Pretty minimal, although the 2-megapixel camera with LED flash might come in handy for work-related snaps.If all of that appeals, check with your local Sonim dealer for price and availability.