Rugged is an understatement with the Sonim Xtreme Performance Three (XP3) Enduro ($600). This Tri-band GSM/GPRS phone is waterproof, impact resistant, and is impervious to sand, dust, mud and micro particles. In addition to being IP-57 and Mil Spec 810F certified, this hardcore handset has hardened rubber bumpers, a higher volume speaker, Bluetooth, and operates in extreme temperatures (from about 4º F to 176º F). In our testing, it easily lives up to all claims. If your job or sport of choice tends to destroy normal cell phones, don't say we didn't give you a heads-up on the answer.