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NUU

NUU B40 5G Cell Phone Unlocked, T-Mobile,8GB+256GB, Midnight Grey

  • Based on 104 reviews
Condition: New
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Availability: 20 left in stock
Fulfilled by Amazon
Arrives Wednesday, Oct 7
Order within 11 hours and 20 minutes
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Features

  • STAY INFORMED WITHOUT UNLOCKING NUU B40 android unlocked phone stay updated without waking your main screen. The innovative 1.6" rear Vista Display gives you instant alerts without the need to open or unlock the primary display, making this the ideal smart phone for busy professionals on the move.
  • YOUR POCKET-SIZED ENTERTAINMENT POWERHOUSE - Immerse yourself in the action. From live NFL Sundays to blockbuster movies, the stunning 6.7" FHD+ AMOLED screen and buttery-smooth 120Hz refresh rate ,8GB RAM, 256GB storagetransform this 5G Cell Phone into a premium theater right in the palm of your hands.
  • ULTIMATE FREEDOM WITH TRUE DUAL SIM - Travel smart and easily separate work from play. Standing out among unlocked phones, this t mobile phones unlocked 5G device is ready out-of-the-box for major US carriers like T-Mobile, Mint, and Metro, giving you the ultimate flexibility to choose the best network for your lifestyle.
  • CAPTURE LIFE'S BEST MOMENTS LIKE A PRO - Elevate your social media game effortlessly. The AI-enhanced 64MP rear camera and 16MP front lens automatically adapt to any lighting condition, ensuring your photos and videos always look crisp, vibrant, and ready to share, setting a new standard for 5g android smartphone mobile phones.
  • RELIABLE ENERGY FOR YOUR BUSY LIFESTYLE - Leave your charger at home with confidence. Powered by a massive 5000mAh battery and the ultra-efficient Android 15 OS, this android phone delivers reliable, continuous energy that easily keeps up with your longest commutes and most demanding schedules.

Description

Discover the NUU B40 5G Cell Phone Unlocked— featuring a 6.7" FHD+ AMOLED main screen, a 1.6" rear Vista Display and Dual SIM 5G support for a smarter, more connected mobile experience. NUU B40 5G Cell Phone NUU B30 5G Cell Phone NUU N30 Cell Phone NUU N20 Basic Phone NUU N10 Basic Phone What can I do with the NUU B40 second display? Without flipping your phone, you can check notifications, call previews, control music playback, monitor time, battery level, step count and selfies with the rear 64MP camera. Simple double tap activates it, faster way to stay connected. Is the NUU B40 compatible with my carrier? Does it support Dual SIM? The NUU B40 is a fully unlocked Dual SIM Cell Phone 5G compatible with T-Mobile, Mint Mobile, Metro, Qlink and Tello. Use two lines on one device — ideal for separating work and personal calls, or maximizing coverage on the go. How good is the gaming performance on the NUU B40? The NUU B40 features a 120Hz FHD+ AMOLED display, Octa-Core 2.5GHz processor and 8GB RAM for smooth, lag-free gameplay. Enjoy fluid motion, vivid colors and fast app loading — great for gaming, streaming and watching sports. What is the camera setup on the NUU B40? The NUU B40 has a 64MP rear camera, 2MP macro lens and 16MP front camera, all enhanced by AI optimization for sharp, clear shots in any lighting. Perfect for creators and everyday users of unlocked Android phones. My NUU B40 5G phone isn't charging to full. What should I check? Check if Adaptive Charging (Battery Protection / Custom Charging Mode) is enabled in Settings. This optional feature limits charging to preserve battery health. Simply disable it — or adjust the charge limit — to restore full charging capacity.

Brand: NUU


Operating System: Android 15


Ram Memory Installed Size: 8 GB


CPU Speed: 2.5 GHz


Memory Storage Capacity: 256 GB


Screen Size: 6.7 inches


Resolution: 1080 x 2400


Refresh Rate: 120


Model Name: Series B


Wireless Carrier: Unlocked


Operating System: Android 15


RAM Memory Installed: 8 GB


Processor Speed: 2.5 GHz


Memory Storage Capacity: 256 GB


Color: Midnight Grey


SIM Card Slot Count: Dual SIM


Connector Type: USB Type C


Form Factor: Bar


Biometric Security Feature: Fingerprint Recognition


Sim Card Size: Nano


Water Resistance Level: Not Water Resistant


Headphones Jack: USB Type-C


Compatible Devices: T-Mobile


EU Spare Part Availability Duration: 1 years


Additional Features: Dual Display, Dual SIM, Rear display phone


Flash Memory Supported Size Maximum: 256 GB


Front Photo Sensor Resolution: 16 mp


Rear Facing Camera Photo Sensor Resolution: 64 mp


Camera Description: Front, Rear


Camera Flash: LED


Number of Rear Facing Cameras: 2


Number of Front Cameras: 2


Battery Capacity: 5000 milliamp_hours


Battery Description: Lithium-Polymer


Battery Power: 5000 milliamp_hours


Effective Video Resolution: 64 mp


Video Capture Resolution: 9216 x 6912


Frame Rate: 120 fps


Screen Size: 6.7 inches


Resolution: 1080 x 2400


Refresh Rate: 120


Display Type: AMOLED


Display Resolution Maximum: 1080x2400


Display Pixel Density: 393 pixels_per_inch


Wireless Provider: Unlocked


Cellular Technology: 5G


Connectivity Technology: Bluetooth


Wireless Network Technology: Wi-Fi


Brand: NUU


Model Year: 2025


Built-In Media: Phone Case, Power Adapter, USB Cable


Warranty Description: 1 Year Manufacturer


Manufacturer: Nuu Mobile


Model Series: B40


Specific Uses For Product: gaming, streaming, photography


Unit Count: 1 Count


Item Weight: 187 g


Battery Average Life: 38 hours


Phone Talk Time: 38 hours


GPS Geotagging Functionality: A-GPS


Supported Satellite Navigation System: GPS


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Oct 7

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews

    • Bought it for 1 reason, kept it for many more.
Uuhhhhh, I thought the second screen on the back was a pretty cool feature, but once I got the phone, it is pretty useless. It has 4 pages (?) I guess, music, camera, a compass, and the main screen, which fur some reason is called the dial. And there's , I think, 10 options fur his how it looks. I dunno, I bought the phone cuz of the second screen, after I checked it out, I haven't used it again. And it seems to always be on. There aren't many settings for it. , maybe it'll be better in later versions? Who knows. Even so, the phone itself is a good phone. Lots of ram, and an internal 256 gb is pretty nice. Would be better if I could put in a memory card but it's not expandable. The camera has hella modes, which is cool. The phone is thin and light. Also, it's unlocked, and it's 100% compatible with my cell service. My last 2 phones weren't and some of the features didn't work. So it's a good phone, good price, battery is not as big as other phones, but seems to last long, charges hella quick. You won't be disappointed if you buy it. ... show more
Reviewed in the United States on December 22, 2025 by Paul parres
    • Seems good. Just not for me.
Edit: I should have also said the Seller was very courteous & helpful. It's a nice phone. Attractive & seems well made. Mine worked as it should, to the extent I tested it. I never put a SIM card in it. I was more interested in the 6GB onboard memory capacity. I suspect that's more than ample for most users. It just wasn't enough for me b/c I use too many apps & files simultaneously. The only ~fair ding I could give it is that the rear screen seemed more for eye candy than function but that's kind of obvious before buying, and maybe it serves a real wish for some % of users. ... show more
Reviewed in the United States on August 3, 2026 by Barry M.
    • The phone Quality and the Price
Very good 💯 😊
Reviewed in the United States on September 22, 2026 by sakerie
    • Excellent for the price.
Excellent phone. bright responsive screen. The only thing for me would be to have additional memory. the internal one is well enough but really could greatly improve if I could add more. this is the only reason I did not give it 5 stars
Reviewed in the United States on January 31, 2026 by Symbyot
    • Can't add storage
Update -it is very difficult to find a screen protector for the phone. I bought a case for it and the screen protector quality was poor. I ended up cracking the phonescreen with a gentle bump on my dress drawer because you can't find a screen protector for this phone. Pretty cool phone for the price but misleading with storage. It says max 256 for flash storage but I don't see anywhere to put extra storage. 🥺 ... show more
Reviewed in the United States on December 25, 2025 by M D K
    • Best Phone for the Money
This is a great phone in the $200 range. It does most of what the $1,000 Galaxy phones do for 1/5th of the price. Battery life could be better. It takes me 2 charges to get through a day, but I am always on it. The display is large and vivid. The camera takes amazing photos. The RAM and processor speed make this phone mighty. Fully unlocked so all you need to do is drop in your SIM card. This is my 2nd NUU device and I can't justify the cost to go back to Samsung. ... show more
Reviewed in the United States on March 28, 2026 by William Thick Jr.
    • Perfect
Great phone came at the perfect time too as my current phones screen went out
Reviewed in the United States on September 4, 2026 by Crystal maxwell
    • Disappointed,
Only good as a temporary phone or for someone not needing to use a lot. Phone is lagging after just a few weeks with minimal daily use.
Reviewed in the United States on April 19, 2026 by George

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