Mobile phones don’t come much tougher than this – the new Sonim XP3 Sentinel handset, the “new safety solution for lone workers”. If you’re a bit bored by the imminent launch of the iPhone 4, then the latest Sonim device might be just what you’re looking for. Certainly not boring or average, the XP3 Sentinel is the newest tough handset in a long line of tough handsets, including the XP2 and XP3 Enduro. Designed to keep you safe in “isolated and hazardous environments”, the Sonim XP3 has a Gorilla glass screen that is resistive to humidity, shock and heat, and a clever keypad that lets yo...