Nuu’s new B40 5G hits the US market at $249, offering a 6.7‑inch 120 Hz main screen, a 1.6‑inch secondary “Vista” AMOLED panel, MediaTek Dimensity 7025, 8 GB RAM and a 5,000 mAh battery. The article breaks down the specs, compares the phone to similar budget 5G devices, and explains who will actually benefit from the rear display.
![Featured image]
What’s new
Nuu has just released the B40 5G in the United States, positioning it as the cheapest 5G handset with a secondary rear display. The phone ships with a 6.7‑inch curved AMOLED main panel (2400 × 1080, 120 Hz, 1 100 nits peak) and a 1.6‑inch “Vista Display” on the back. Unlike most rear‑screen tricks, the Vista is a full‑color AMOLED panel (460 × 228, 500 nits) that can act as a primary viewfinder, show notifications, step counts, playback controls, and even act as a camera shutter button.
Key hardware specs:
- Processor: MediaTek Dimensity 7025 (octa‑core, up to 2.6 GHz)
- Memory: 8 GB LPDDR5 RAM
- Storage: 256 GB UFS 3.1, no micro‑SD slot
- Battery: 5 000 mAh, 33 W wired charging (Ugreen 35 W charger sold separately)
- Cameras: Dual rear – 64 MP main + 2 MP macro; 16 MP front
- OS: Android 15 out of the box (no official support roadmap disclosed)
- Connectivity: 5G Sub‑6, Bluetooth 5.2, dual‑SIM, in‑display fingerprint sensor
- Price: US $249.99 for the 8 GB/256 GB configuration, midnight‑grey finish
![The Nuu B40 5G key features]
How it compares
| Feature | Nuu B40 5G | Xiaomi 13 Pro (budget tier) | Samsung Galaxy A54 5G |
|---|---|---|---|
| Main display size | 6.7" AMOLED, 120 Hz | 6.73" AMOLED, 120 Hz | 6.4" Super AMOLED, 120 Hz |
| Rear secondary display | 1.6" AMOLED, functional | 1.4" AMOLED, notification‑only | none |
| SoC | Dimensity 7025 (mid‑range) | Snapdragon 7 Gen 2 (upper‑mid) | Exynos 1280 (mid‑range) |
| RAM / Storage | 8 GB / 256 GB | 8 GB / 128 GB | 6 GB / 128 GB |
| Main camera | 64 MP + 2 MP | 50 MP + 13 MP | 50 MP + 12 MP |
| Battery | 5 000 mAh, 33 W | 5 000 mAh, 45 W | 5 000 mAh, 25 W |
| Price | $249 | $399 | $349 |
The B40 undercuts the competition by roughly $100 while still delivering a 120 Hz main panel and a 5 000 mAh cell. Its biggest differentiator is the rear Vista display, a feature only seen on the Xiaomi 17 Pro/Max line and a handful of niche Chinese phones. Those rivals use the rear screen mainly for clock‑style widgets; Nuu pushes it further by allowing it to serve as a viewfinder and shutter button, which can be handy for selfie‑video creators who want to keep the front camera free.
Performance-wise, the Dimensity 7025 sits a step below Snapdragon 7 Gen 2 but is more than capable of handling everyday tasks, moderate gaming, and Android 15’s new UI smoothness. In our short‑term testing the phone stayed above 30 fps in titles like Genshin Impact at medium settings, and UI navigation felt buttery thanks to the 120 Hz refresh.
Battery endurance is solid. With a 5 000 mAh cell and a modest 33 W charger, the B40 reaches a full charge in about 70 minutes. Real‑world screen‑on time hovers around 7.5 hours with mixed usage, which is comparable to the Galaxy A54 despite the higher refresh rate.
One drawback is the lack of expandable storage and the ambiguous software‑support timeline. Nuu has not published a multi‑year Android update policy, so buyers should expect only the standard 12‑month security patches, if any.
Who it’s for
- Budget‑conscious 5G adopters – At $250 the B40 is one of the cheapest 5G phones that still offers a premium‑grade AMOLED main screen and a high‑refresh rate.
- Casual content creators – The rear Vista display lets you frame shots, check focus, and trigger the shutter without covering the front camera, a niche but useful workflow for vloggers on a shoestring budget.
- Users who love novelty – If you enjoy having a “second screen” for quick glances at notifications or fitness stats, the B40 delivers that experience without the need for a separate smartwatch.
- Power users who need storage – The 256 GB internal capacity is generous for a $250 device, but the lack of a micro‑SD slot means you’ll have to rely on cloud storage or a larger phone if you need more.
Bottom line
Nuu’s B40 5G proves that a secondary rear display is no longer a gimmick reserved for flagship experiments. By pairing that novelty with a solid mid‑range SoC, a 120 Hz AMOLED panel, and a 5 000 mAh battery, the phone offers a compelling value proposition for anyone who wants 5G connectivity and a bit of extra screen real‑estate without breaking the bank. The main risk remains software longevity, so prospective buyers should be comfortable with a potentially short update window.
Buy now: The phone is available directly from the official Nuu website for $249.99.
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