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The XP1 comes with a 3 year guarantee, plus a life time warranty for the phone housing with immediate in-store replacement if needed. It is the only phone that doesn’t compromise on capability, durability or style.
Some special features of this phone are:
Water and Humidity
IP Certification 54 – Interior mechanisms can withstand the entry of a stream of water at a 90 degree angle.
Temperature Ranges
The phone’s operational range is between -20 to +60 degrees Celsius.
Shock and Vibration
Rated to 1.65m drop to concrete; protection from 5Hz to 500Hz.
Screen
XP1’s screen is protected by an advanced scratch resistant coating.
Durable Casing
The phone is cased in hardened rubber molding, cast via dual injection.
Durable Mechanics
The key pad buttons are tested to 500,000 pushes, while dedicated PTT buttons are tested to 200,000 pushes.
Dirt and Dust
The non-porous casing blocks entry of the smallest of micro-particles.
Source : http://www.ixibo.com/2009/03/toughest-gsm-cell-phone-sonim-xp1/#more-922