The CAT S31 is a midrange smartphone, but still built to be tougher than most with waterproofing and a rugged body designed to military-standards
Priced at $330, the S31 misses out on top-quality performance, but is still built to survive the harshest environments
Cat® S31 Smartphone - #BeUnstoppable
CAT S31 review: Midrange handset is still tougher than most - Gearbrain
CAT S31 review: Midrange handset is still tougher than most - Gearbrain
CAT S31 Smartphone Review - Reviews
CAT S31 Review - Hardened to the Core
S31 CAT Construction Phone Review - Tool Box Buzz Tool Box Buzz
CAT S31 Review - Hardened to the Core
CAT S31 Review - Hardened to the Core
CAT S31 Smartphone Review - Reviews
Cat® S31 Smartphone - #BeUnstoppable
Cat S31 Review - One of the Toughest Phones on the Market?
S31 CAT Construction Phone Review - Tool Box Buzz Tool Box Buzz
CAT S31 Review - Hardened to the Core
CAT's latest rugged smartphones won't break your budget - The Verge
CAT S41 and S31 hands-on at #CES2018