This $249 phone has one feature that should be standard on all phones

(Image credit: Tom's Guide)

I’m a videographer at heart, and I always remind myself to use the superior rear cameras on my phone whenever I shoot video — whether it’s for vlogging or quick self-recordings. Yet, we’ve been conditioned to settle for a ridiculous compromise by choosing the downgraded front-facing camera instead.For years now, the industry has led us to believe that the only real solution to this is foldable phones, largely because their secondary outer displays make it practical to see yourself while using those better cameras. But what irritates me is that many of the best foldable phones cost a fortune — including recent options like the Motorola Razr Fold.Enter the NUU B40 5G. It's a $249 phone with a god-awful name, but it hides a secret feature that I think all phones should have: a secondary rear screen. After using it for a week, it proves that this simple addition should be standard across the entire industry. Here’s why.Swipe to scroll horizontallyNUU B40 5G: SpecsHeader Cell - Column 0 NUU B40 5GPrice$249Display6.7-inch AMOLED FHD+ (1080 x 2400)Refresh Rate120HzChipsetMedia Dimensity 7025RAM8GBStorage256GBRear Cameras64MP main (f/1.89), 2MP macroFront camera16MPBattery5,000 mAh Charging Speed35 wiredDimensions6.39 x 2.91 x 0.33 inches (162.4 x 73.9 x 8.4mm)ColorsMidnight GreyTiny, but functional rear screen(Image credit: Tom's Guide / John Velasco)If you look closely at the camera module, you’ll see something peculiar that stands out. It’s actually a secondary screen, dubbed the Vista Display, which is a 1.6-inch AMOLED panel with a resolution of 420 x 228 pixels.Needless to say, it’s tiny compared to the secondary screens I see on flip-style phones like the Galaxy Z Flip 7 and Motorola Razr Ultra, but my point is that it’s highly effective for exactly what I need. One of the biggest challenges of shooting with a standard slab phone like the iPhone 17 Pro is that I’m usually shooting blind.Image 1 of 2NUU B40 5G selfie camera.(Image credit: Tom's Guide / John Velasco)Thanks to this preview screen, despite its diminutive size, it still gets the job done almost as well as a foldable phone. Not only can I see myself, but I can also frame the shot exactly the way I want. When I’m ready, I can even start the recording without ever needing to touch the main display. And best of all, it puts out way better results than using the front-facing camera with the selfies I captured above.Makes selfie screen accessories obsolete