CAT® S31 Rugged Dual-SIM Smartphone (16GB, Black)

Save 21%

Unlocked (what's this?)

What is an "Unlocked" phone?

Many mobile phones are designed to use a Subscriber Identity Module (SIM) card to store subscriber data. These SIM cards are issued by the carrier and provide voice & data service to the phone. "Locked" mobile phones will only recognize SIM cards from the carrier that originally provided the phone. Almost all mobile phones provided by local carriers are locked to that carrier’s network and cannot be used on other networks.

"Unlocked" mobile phones can use SIM cards from any carrier that supports the phone's operating frequencies. This makes them more convenient for switching carriers & traveling abroad. As many carriers also require customers to purchase pricey 2-year data contracts with new smartphone purchases, buying an "unlocked" phone can also be cheaper in the long run, as it allows customers to use "pre-paid" and "no-contract" SIM-card options or to switch to a new carrier when a cheaper, better plan becomes available.

  • HK$2,279 HK$2,882

  • Free Shipping Available

  • In Stock Now

Breath easy with EXPANSYS extended service plans.

You love your new phone so why don’t you protect it.

With our extended 12-month service plan your investment will be safe and secure and you can rest easy.

Because life is unpredictable, extend your device protection from 6 months to 12 months and protect your device from mechanical and electrical failures that just sometimes happen.

For a minimum investment, you can ensure the safety and security of your purchase for an additional 6 months.

For just a few extra dollars each month; your device will always be safe and secure when you purchase the EXPANSYS Extended Service Plan. You can’t beat that value.

Why You’ll Love Our Extended Service Plans

  • Protects Your Device From Mechanical and Electrical Failure, Including Touchscreen Failure, Power-On Issues, Antenna/Wi-Fi Failure, & much more
  • Free Shipping On Returns
  • If we can’t fix your device, we’ll get you a replacement at no extra charge!

Don’t get stuck with expensive out of warranty repairs.  Get protected today!  

*Extended Service Plans must be purchased with device, and cannot be added once item has shipped
*Extended Service Plans cannot be refunded once item has shipped
*Extended Service Plans cannot be applied to b-stock, refurbished, or open-box items
*Extended Service Plans will not cover return shipping outside of the original delivery country
*Extended Service Plans do not cover accidental damage including damaged caused by drops, water, bending, or damage caused by installed applications or rooting

For complete terms and conditions of EXPANSYS warranty services, please click here.


Check out with PayPal
  • EXPANSYS Code: 308200
  • , EAN: 5060472350916
  • , Mfr: CAT_S31
  • , Brand: CAT®

Email Alerts

Add me
standard warrantyFree shipping

CAT® S31 Rugged Dual-SIM Smartphone Features

  • Long-lasting 4000mAh battery with up to 30 hours of talk time and 38 days stand by time
  • Dust and drop proof, with a scratch-resistant screen that works with a wet hand or with gloves on
  • IP68 certified waterproof up to 1.2m for 35 minutes
  • Shipping Weight: 0.45kg

Technical Details

  • System: Google Android Nougat
  • Processor: Quad Core / 1.1 GHz / Qualcomm Snapdragon 210 MSM8909
  • Memory: Internal: 16 GB / RAM: 2 GB / Slot type: microSD / Max. slot capacity: 128 GB
  • Display: 4.7" / HD 720 IPS / Super Bright Display / Wet finger/Glove-on working
  • Camera: 8 MP / Flash: LED / Autofocus / Front: 2 MP
  • Network: 4G: LTE Band 1/2/3/5/7/8/20 / 3G: 850/900/1900/2100 MHz / GSM: 850/900/1800/1900 MHz
  • SIM card: Type: nano-SIM / Slot: Dual-SIM
  • Wireless: Bluetooth: 4.1 / Wi-Fi: IEEE 802.11 b/g/n, 2.4 GHz
  • Connection: Jack 3.5 mm / micro USB
  • Location: GPS, aGPS, Glonass, BeiDou
  • Water Protection: Beyond IP68 certified / up to 1.2m for 35 mins
  • Military Standard: MIL-SPEC 810G, Shock and Drop, Category 4 vibration
  • Sensors: Accelerometer, Ambient Light Sensor, eCompass, Proximity Sensor
  • Battery: 4000 mAh (Built-in) / Talk Time: up to 30 hrs / Standby Time: up to 38 days
  • Weight: 200 g
  • Dimensions: 146 x 74.42 x 12.6 mm

User Reviews

Support Forums