Oh there is definitely proof of that, lots of it.

You would not BELIEVE the lengths Nokia go to with their testing procedures. The resources they pour into testing are immense, and well beyond the means of smaller companies. For example just one impact-testing slow-mo camera costs over ten thousand euros, and is used to measure how the phone deforms when it is dropped.

Even if you totally ignore device OS and software, the hardware alone has to go through a LOT of hoops before it gets released: tumble tests, drop tests, multi-point bending tests, moisture tests, splash tests, temperature tests, repeated use tests etc.

All About Symbian was invited to tour Nokia's testing facility (which is based in the UK) and here's a video shot by my editor Steve Litchfield:

http://www.allaboutsymbian.com/media...arnborough.php

You can also watch the tour on Google Video:

http://video.google.com/videoplay?do...21695595&hl=en

And all this is just internal testing. A lot of tests have to then be repeated independently in order to receive certificates from various government bodies around the world.