CAT - S40 4G LTE with 16GB Memory Cell Phone (Unlocked) - Black

  • Model: CS40SUBU01UN
  • SKU: 5579857
Get to work with this unlocked CAT S40 smartphone. Its rugged exterior houses an extra-bright 4.7-inch screen and a long-lasting battery that provides up to 18 hours of talk time. Built for tough use, this device is immune to dust, high temperatures and 6-foot drops. The sensitive touch screen of this CAT S40 smartphone is readable in strong sunlight.

Benefits of unlocked phones
Protection Plan Options


What's Included

  • CAT S40 4G LTE with 16GB Memory Cell Phone (Unlocked)

Ratings & Reviews

Overall Customer Rating:
100% of customers would recommend this product to a friend (5 out of 5)


Qualcomm Snapdragon 210 processor

Quad-core 1.1GHz processor and 1GB of RAM deliver outstanding overall performance for opening and running applications, flipping through menus, running home screens and more.

Android 5.1 Lollipop OS

New colors and typography, new ways to control when and how you receive messages, and new security features, including Android Smart Lock, which secures your phone by pairing it with a trusted smartwatch or other device.

Compatible with GSM carriers, including AT&T and T-Mobile

Also compatible with GSM SIM Kits, including Cricket Wireless, Tracfone, Net10, H2O, GoPhone and Simple Mobile.

4G LTE speed

Provides fast Web connection for downloading apps, streaming content and staying connected with social media.

4.7" IPS touch screen

Large, clear screen lets you browse apps, view photos and watch videos in crisp detail.

8.0MP rear-facing camera

Capture images and videos on the go. Built-in LED light. Also includes a 2MP front-facing camera.

16GB internal memory plus microSD slot

Provides plenty of storage space for your contacts, music, photos, apps and more. Expand storage up to 64GB by adding a microSD card (sold separately).

Use your smartphone as a mobile hotspot

Share your 4G data connection with other compatible wireless devices.*

Tough build for outdoor use

This phone is shock, water and dust resistant, and is built with a rugged case for added protection.

Access to Google Play

Browse and download apps, magazines, books, movies, and television programs directly to your phone.

Listen to your favorite tunes

Store and play your MP3 files on your phone.

SIM card not included.

* Phone will not work with Sprint, Verizon, Boost Mobile, Virgin Mobile or any other CDMA network.

Customer rating

would recommend to a friend

Expert rating

  • Rating: 4 out of 5 stars

    Good overall, some minor drawbacks.

    • Verified PurchaserVerified Purchase
    • My Best Buy® MemberMember

    The speaker is somewhat muffled, and some user applications are cumbersome to me. I am a new smart phone user as I have had flip phones until now. Probably some of the awkwardness is due to inexperience and hopefully I will overcome that in (a short) time.

    I would recommend this to a friend

  • Rating: 5 out of 5 stars

    Good camera

    • Verified PurchaserVerified Purchase
    • My Best Buy® MemberMember

    Its an awesome phone specially if you work for construction. The phone has fallen from heights n has no scratches at all as if i would of had a regular phone it wouldnt had made it at all.

    I would recommend this to a friend

  • Rating: 2 out of 5 stars


    • Verified PurchaserVerified Purchase
    • My Best Buy® MemberMember

    Processing power isn’t there for rigorous use. I would recommend it for light use only

    I would recommend this to a friend

  • Rating: 4 out of 5 stars

    Great phone working well

    • Verified PurchaserVerified Purchase
    • My Best Buy® MemberMember

    It's a great unlocked phone working with any GSN carrier don't stack up to a contract get this unlocked phone

    I would recommend this to a friend

  • Rating: 3 out of 5 stars

    It was a good phone but if it was compatible wVeri

    • Verified PurchaserVerified Purchase

    I would love to have a phone like that if it was compatible with Verizon

    I would recommend this to a friend

What experts are saying

Rating: 3.2 out of 5 stars with 4 reviews

Click to visit alaTest website
The analysis of all aggregated expert reviews shows that the reviewers are positive about sound, screen, battery and price. Editors are less positive about camera. Using an algorithm based on product age, reviewers ratings history, popularity, product category expertise and other factors, this product gets an alaTest Expert Rating of 79/100 = Good quality.
  • Tom's GuideRating, 3 out of 5Cherlynn Low on December 29, 2015
    Cat S40 Review: The Monster Truck of Phones
    Built to withstand harsh environments, the S40 is certainly one of the most rugged phones we've tested, surviving everything from drops to dunks. It also offers solid battery life. But its lackluster cameras and low-res display make the $400 priceFull Review
  • PocketnowRating, 3.6 out of 5Adam Doud on October 31, 2015
    Cat S40 review: Fort Knox guarding fool's gold
    The Cat S40 is one of the most durable phones we have ever tested. But do the insides justify that protection?Full Review
  • PCMagRating, 3 out of 5Ajay Kumar on October 26, 2015
    Caterpillar Cat S40 (Unlocked)
    The unlocked Cat S40 from Caterpillar is a rugged phone that can take a beating, but you're trading screen resolution and speakerphone quality for durability.Full Review
  • Phone ScoopEric M. Zeman on October 18, 2015
    Review: CAT S40
    CAT is offering the rugged S40 to U.S. buyers directly online. This Android smartphone is designed to take a beating and still get you to your meeting on time. This phone is sold unlocked and works with networks such as those run by AT&T andFull Review

Product images, including color, may differ from actual product appearance.