From : http://www.gsmarena.com/nokia_3720_is_ready_to_replace_golf_and_rugby_balls-news-1006.php
Seems like the 3720 is taking on the previous 5xxx Active Range phones like the 5500 sport and the classic 5140 and 5210 for a game of rugby, golf, swimming, drinking and falling off roofs...
I came across this interesting bit of news on GSM arena about the tests Nokia does on their phones.
http://www.gsmarena.com/nokia_reveals_phone_testing_routine-news-686.php
Very kewl images that goes with it ;)
Kinda makes you understand why their phones outlast the rest.