Testing mobile phones
Siemens has a nice selection of photographs showing how they test their mobiles: the dust test, the splash test, the vibration test, and so on. Click here to go to their photo gallery. (external link) This is the accompanying text of just one image:
"A mobile phone must be able to withstand a lot: during the temperature test (thermo-vibro chamber) performed in the Siemens test lab, each new device is exposed to electrodynamic fluctuations and temperature changes of between minus 25 degrees (-13F) and plus 85 degrees Celsius (+185) over three eight-hour periods. The temperature test is one of some 20 basic tests used to test the quality of all Siemens handsets."

The dust test in action