---
product_id: 51656745
title: "S31 Unlocked mobile, Black"
brand: "cat"
price: "$1351.46"
currency: USD
in_stock: true
reviews_count: 5
category: "Cat"
url: https://www.desertcart.us/products/51656745-s31-unlocked-mobile-black
store_origin: US
region: United States of America
---

# 4G LTE Dual SIM Ready 4000mAh Long-lasting Battery Gorilla Glass 3 Tough Screen S31 Unlocked mobile, Black

**Brand:** cat
**Price:** $1351.46
**Availability:** ✅ In Stock

## Summary

> 📱 Tough Tech for the On-the-Go Pro Who Demands More

## Quick Answers

- **What is this?** S31 Unlocked mobile, Black by cat
- **How much does it cost?** $1351.46 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/51656745-s31-unlocked-mobile-black)

## Best For

- cat enthusiasts

## Why This Product

- Trusted cat brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Power That Lasts:** Massive 4000mAh battery delivers up to 30 hours talk time and 38 days standby—stay unplugged longer.
- • **Trusted Toughness:** Built by CAT, the heavy machinery icon, this phone is engineered for durability and real-world resilience.
- • **Unstoppable Connectivity:** Dual SIM with extensive 2G/3G/4G LTE bands keeps you connected worldwide without compromise.
- • **Rugged & Reliable Display:** 4.7-inch HD screen protected by Corning Gorilla Glass 3 resists scratches and daily wear.
- • **Expandable Storage Freedom:** 16GB internal storage plus microSD support up to 64GB means space for all your essentials.

## Overview

The Cat S31 Unlocked Mobile Phone combines rugged durability with essential smartphone features: a 4.7-inch Gorilla Glass 3 display, dual SIM 4G LTE connectivity, an 8MP camera, and a powerhouse 4000mAh battery. Designed for professionals who need a reliable device that withstands tough environments without sacrificing performance or connectivity.

## Description

Product Description Network Compatibility : SIM CARD 1 ( 2G GSM 850 / 900 / 1800 / 1900 and/or 3G 850(B5) / 900(B8) / 1900(B2) / 2100(B1) and/or 4G LTE 800(B20) / 850(B5) / 900(B8) / 1800(B3) / 1900(B2) / 2100(B1) / 2600(B7) ) and SIM CARD 2 (2G GSM 850 / 900 / 1800 / 1900)4.7" inch, TFT capacitive touchscreen, 720 x 1280 pixels, Corning Gorilla Glass 3, Camera (8MP, Secondary 2MP)16GB Storage, 2GB RAM, microSD Card slot, up to 64GB, Android 7.0 (Nougat), Qualcomm MSM8909 Snapdragon 210, Quad-core 1.3 GHz Cortex-A7Non-removable Li-Ion 4000 mAh battery, Stand-by: Up to 38 days, Talk time: Up to 30h (3G)In the Box : Caterpillar CAT S31 Dual-SIM Smartphone, In-built Battery, USB Power Cable, Charging Power Adaptor, Quick Start Guide Box Contains telephone, charger, USB cable, headset

Review: Nicht mein erstes CAT und da beim Vorgänger nach 5 Jahren die Ladebuchse wohl einen Wackelkontakt hatte, so daß man beim Laden immer etwas tricksen musste, habe ich mich dann doch entschlossen dem S30 ein S31 folgen zu lassen. Der Preis des Verkäufers war gut, Versand etc. einwandfrei. Ich habe keine Probleme mit dem Telefon, weder mit Bluethoot noch mit den im Gegensatz zum Vorgänger deutlich herausstehenden seitlichen Tasten was von einigen Benutzern immer mal bemängelt wird. Das einzig nervige ist der ständig präsente Google und Tcom Schrott aber das betrifft grundsätzlich alle Mobile Phones
Review: 追記 2019/6/21 OS 8.1にアップしました。 外部SDは128ギガを認識しますし同梱の説明書にもそのとおりの記載があります。 説明写真と異なりストラップホールが無いのでalumania STRAP TYPE HEADPHONE CAP for 3.5mm PLUG (ブラック)を購入してしようしています。イヤホンジャックのキャップは切り取りました。キャップにはシールドが無いので単にホコリ対策と思いますが、上記製品をガシガシにねじ込んでおけば防水性に問題はなさそうです。 また、中華タフネススマホに良く見られる深いusb、イヤホンジャックではなく、国内の普通の規格なので安心です。 何よりも信頼の重機メーカーCATのロゴが光っています。 またスピーカーも前面に配置されているので実用的、4000mAhのバッテリー、前面物理ボタンのタッチ感が良く、側面には余計なSOSボタンも有りません。

## Features

- Media type: GIF

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B075MNKBFQ |
| Guaranteed software updates until | unknown |
| Item model number | S31 |
| Manufacturer | Cat phones |
| Product Dimensions | 7.44 x 1.26 x 14.6 cm; 200 g |

## Product Details

- **Brand:** CAT
- **CPU model:** Cortex
- **CPU speed:** 1.3 GHz
- **Memory storage capacity:** 16 GB
- **Model name:** S31
- **Operating system:** Android 7.0
- **RAM memory installed size:** 2 GB
- **Resolution:** 720 x 1280
- **Screen size:** 4.7 Inches
- **Wireless carrier:** Unlocked

## Images

![S31 Unlocked mobile, Black - Image 1](https://m.media-amazon.com/images/I/81LX1yzh5ML.jpg)

## Questions & Answers

**Q: Does this 'phone work on 02 network?**
A: Is unlocked, can be used in any network

**Q: Is this phone waterproof and dust proof?**
A: Yes it is

**Q: has it got expandable memory? (sd card slot)**
A: Yes… manual says.. INSTALLING A MEMORY CARD
1. Place your device on a flat surface with the display facing down. Then open the side door.
2. Insert a microSDTM card into the memory card slot with gold pins facing upwards.
NOTE:
• Push the memory card until you hear a locking sound.
• To remove the microSD card, press against the edge of the memory card and release it.
• Do not force the microSD card as this could damage the memory card or slot.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by K***N on 1 August 2020*

Nicht mein erstes CAT und da beim Vorgänger nach 5 Jahren die Ladebuchse wohl einen Wackelkontakt hatte, so daß man beim Laden immer etwas tricksen musste, habe ich mich dann doch entschlossen dem S30 ein S31 folgen zu lassen. Der Preis des Verkäufers war gut, Versand etc. einwandfrei. Ich habe keine Probleme mit dem Telefon, weder mit Bluethoot noch mit den im Gegensatz zum Vorgänger deutlich herausstehenden seitlichen Tasten was von einigen Benutzern immer mal bemängelt wird. Das einzig nervige ist der ständig präsente Google und Tcom Schrott aber das betrifft grundsätzlich alle Mobile Phones

### ⭐⭐⭐⭐⭐ Review
*by ね***君 on 14 November 2018*

追記 2019/6/21 OS 8.1にアップしました。 外部SDは128ギガを認識しますし同梱の説明書にもそのとおりの記載があります。 説明写真と異なりストラップホールが無いのでalumania STRAP TYPE HEADPHONE CAP for 3.5mm PLUG (ブラック)を購入してしようしています。イヤホンジャックのキャップは切り取りました。キャップにはシールドが無いので単にホコリ対策と思いますが、上記製品をガシガシにねじ込んでおけば防水性に問題はなさそうです。 また、中華タフネススマホに良く見られる深いusb、イヤホンジャックではなく、国内の普通の規格なので安心です。 何よりも信頼の重機メーカーCATのロゴが光っています。 またスピーカーも前面に配置されているので実用的、4000mAhのバッテリー、前面物理ボタンのタッチ感が良く、側面には余計なSOSボタンも有りません。

### ⭐⭐⭐⭐⭐ Review
*by B***A on 15 March 2020*

My speaker is not working, I can't make video calls without using ear phones

## Frequently Bought Together

- Cat S31 Unlocked mobile, Black
- CAT S75 128GB 5G SIM Free Smartphone - Black
- Caterpillar CAT S42 H+, Dual, 32GB 3GB, Black

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-06*