3. CAT S40 

Caterpillar is well-known in the best rugged smartphones market. In terms of rugged features, CAT S40 can drop from 6-foot above the ground without breaking and survive at 1 meter under the water for 60 minutes. The device also comes with dust-proof, shock-proof. It can still run smoothly under low temperature and high vibration condition. The S40 has an ultra-bright 4.7″ IPS screen which supports viewing in the sun. In addition, CAT S40 supports a 3000mAh battery. Other CAT S40 specs include Android 5.1 and Gorilla Glass 4.

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