Nokia places a phone under a bunch of needle-sized water dispensers and then lets it drip all over the phone, which tests for resistance in situations like rain, or splashing from a pool.
The humidity simulation, which tests the durability of phones in up to 95% humidity, is helpful in determining if a phone will hold up in particularly damp areas like South and Central America, where gadgets don't have the longest lifespan.
Nokia also tests how the phone reacts to various liquids, creams and gels (lotions, hand sanitisers, etc...), since stuff like that tends to accidentally spill while sitting in a purse or backpack with the phone.
Tests for bending and twisting are pretty straight forward and self explanatory. Still, you can't help but cringe to see a phone placed in such an unnatural position. Nokia says when you have your phone in your back pocket and you sit on it, it's susceptible to bending.
One of the cooler stress tests that exists is the Drop test—not only because it uses a giant friggin' machine, but also because they record the drops using a camera that can record 100,000 frames per second, which is 3,000 times faster than the normal video camera. The videos are then analysed frame by frame, determining the degree to which a device becomes distorted upon impact. Check it out.
When Nokia drops a phone, they drop it from about the height of a shirt pocket onto concrete, since that's a likely scenario for dropped phones. They also attatch a phone under a steel device that pushes down 100 newtons of force.
Nokia has a series of wear and tear stress tests, when gauge the phone's ability to take bumps, scratches from daily use. Dust testing involves throwing a handful of phones in a dust filled box and letting everything co-mingle. How much dust gets inside? And do buttons stop working when foreign substances get under the surface? This is where you find out.
They also let phones roll around in a bunch of pieces of hard, pointy plastic to see where it might scratch, scuff or crack under duress. These pieces are like plastic chocolate chips and bite-sized pyramids, and they're pretty sharp. This phone met an unfortunate demise in the name of quality control.
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