Free screen replacement warranty

Play video
UK Model - Dual SIM / Black / 16GB + 2GB RAM

Cat S31 SIM Free & Unlocked / UK

Be Unstoppable!

CAT, as a brand, continues to impress us with their range of rugged smartphones. With the CAT S31, they have listened to customer feedback and have produced a phone which can be relied upon to work for several days without charging.

It is also built to handle harsh conditions being IP68 certified and MIL Spec 810G.

Reasons to buy the CAT S31 Unlocked

  • Android 7 Nougat & productivity apps
  • 4.7-inch HD (1280 x 720) screen
  • Corning Gorilla Glass 3 (1.1mm thick)
  • 1.3 GHz Quad-core processor
  • 8MP main camera with LED flash
  • IP68 - water-resistant to 1.2m for 35 minutes
  • Drop-proof to 1.8m
  • Long-lasting 4,000 mAh battery

Box Contents

  • CAT S31 Rugged Smartphone (SIM Free / UK)
  • Quick Start Guide
  • Warranty card
  • Mains charger and micro USB cable
  • Battery Share cable
  • Screen protector
  • Earphones

CAT S31 Overview Unlocked

The CAT S31 is the follow-up to the successful CAT S30, which was a competitively priced rugged phone, which was perfect for professionals who work outdoors.

The S31 continues this trait and improves upon the specification, particularly with the 4000 mAh battery for increased time between charges. There has also been a general updating of the specification. The display now benefits from having a high-definition resolution, while the internal storage and RAM have been increased.

You still have the rugged design which is able to withstand drops of, up to, 1.8 metres and the wet finger and glove support enables usage in challenging environments.

Stay Connected

Ask anyone what they want from a smartphone and the answer will probably be "longer battery life!"

CAT has listened to this feedback and has provided the CAT S31 with a large 4,000 mAh battery. This gives users up to 15 hours continuous talk time on a 3G connection and up to 38 hours standby in standard conditions.

So when you are working in the outdoors or enjoying a hiking trip, you don’t need to rush back to charge your phone.

Go Beyond Rugged

Most rugged phones will tout a MIL-SPEC 810G and IP68 rating. The CAT S31 matches these claims and it also takes further steps.

It adheres to IP68 certification offering water-resistance to 1.2 metres for up to 35 minutes. It's also tough enough to handle thermal shocks, salt mist spray and fine particulates. This makes it ideal for working in harsh environments.

The 4.7-inch screen has been manufactured with high-quality scratch-resistant Corning® Gorilla® Glass 3. Finally, the handset has been drop proof tested onto concrete from, up to, 1.8 metres.

Take Control with Additional Features

Glove Mode

Accessible from the settings, Glove Mode changes the sensitivity settings of the screen so that it is compatible with gloved hands.

Easy Grip Design

Wrapping around the whole handset is a textured, grippy finish. This keeps the phone stuck to the spot, even when rested on inclines and slippy surfaces.

It's also easy to locate in a deep pocket or bag and easier to hold in the hand than the glossy, anodised finished of comparable fashion-style smartphones.


If you have a group of workers in a team, each with their own CAT S31 handset, the PTT button can be utilised with compatible apps for immediate short to medium range communication.

SOS / Lone Worker App

Pre-installed on the CAT S31 is a lone worker app that can be customised. Through this app, a worker in distress or in need of attention can quickly call for assistance, with options to share GPS location.

Easy Read Display

Alongside the Glove Mode mentioned above, the CAT S31 screen has also been designed to minimise glare from direct sunlight and other sources of bright light.

App Toolbox

Looking for some useful and relevant applications? Sick of filtering through thousands of silly games and distractions on the Play Store? With the App Toolbox, you can browse through work-related applications, filtering by industry or keyword.

© 2017 Caterpillar. All Rights Reserved. CAT, CATERPILLAR, BUILT FOR IT, their respective logos, “Caterpillar Yellow”, the "Power Edge" trade dress as well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission.

Bullitt Mobile Ltd is a licensee of Caterpillar Inc.

We cannot guarantee that all gloves will work with the Glove Mode feature.

Battery times (talk time, standby time, and more) are based on 3G and are subject to network and phone usage.

All other trademarks, trade names, product names and logos are the property of their respective owners. Any rights not expressly granted herein are reserved.

Stock Origin & Compatibility

All our phones are SIM Free & Factory Unlocked, compatible with UK, EU & most global SIM cards, with support for global GSM & 3G networks. For 4G/LTE & 5G support outside of Europe, please check the specifications.

Clove Technology primarily obtains stock from a manufacturer's official UK supply chains. These products will be displayed as a 'UK Model'.

Occasionally Clove source products from the European mainland. These will be marked as an 'EU Model', supplied factory sealed with a 2pin EU mains charger or 'EU Convert', opened to swap to a UK charger and resealed.

EU sourced phones will have a full warranty and are compatible with all UK networks. We do not source any products from Hong Kong or other Asian markets.

Operating System
7.0 (Nougat)
Custom Skin
Qualcomm MSM8909 Snapdragon 210�
Quad Core 1.3 GHz
Adreno 304
Expansion Slot
Micro SD
Capacity (Up to)
64 GB
Internal Storage
16 GB
2 GB
720 x 1280 (~312 ppi)
Corning Gorilla Glass 3
Rear Camera
8 MP
Lens & Sensor Tech
Flash & Focus
LED Flash
Front Camera
2 MP
Lens & Sensor Tech
Flash & Focus
4,000 mAh
Non-removable Li-ion
2G/GSM Bands
850 / 900 / 1800 / 1900 MHz
3G/HSPA Bands
850 / 900 / 1900 / 2100 MHz
4G/LTE Bands
1(2100), 2(1900), 3(1800), 5(850), 7(2600), 8(900), 20(800)
5G Bands
802.11 b/g/n
4.1 with A2DP, LE
FM Radio
Power Port
micro USB
Data Port
micro USB
Audio Port
3.5mm audio jack
Video Out
Physical Keyboard
Power, Volume, Android Navigation, Programmable Key
Fingerprint Sensor
Other Controls
Location Technologies
Built-In Maps
Google Maps
Digital Compass
Light Sensor
146 x 74.4 x 12.6 mm (5.75 x 2.93 x 0.50 in)
200 g (7.05 oz)
Google Play, Google App Suite, AVG, Office Suite, File Commander, App Toolbox
Beyond IP68 (water-resistant 2 metres for 60 minutes) | Salt fog, sand, dust, dirt, vibration (Cat4) and pressure resistant | Drop-tested to 1.8m on concrete