The mobile phone was built tough enough to pass military standards 810F according with an array of environmental tests:
A water resistant test was done to simulate exposure to rain at a rate of 2 inches per hour combined with a 40 MPH wind.
It passed a humidity test that was done over 10 days in 24 hour cycles with high temps with 95% humidity.
It was dropped 26 times at different angles from just under 5 feet on to a solid wood surface (while powered off).
It passed a dust resistant test with a simulated dust material proving that the phone would still power up and no moving parts where hindered.