In the latest of its Built For It series of promotional videos, Caterpillar has given one of its super-rugged smart phones the Felix Baumgartner treatment, dropping it from on high from the clamshell of one of the company’s equally durable materials handlers.

And, as if that weren’t proof enough that the phones are almost mind-bogglingly tough, a compact loader then drives over 60 live phones without damaging any of them.

Of course, it would take a seriously operator to subject a phone to this level of abuse during the course of a working day. But it’s reassuring to know that, if he did, the phone would still allow him to call his boss and explain why his new smart phone was a metre under water.