According to Samsung, the Galaxy A51 is among the first phones in the series to offer an Infinity-O display and a macro camera.  Apart from these distinguishing features, it has many of the same specifications as its predecessor, including AMOLED display, processor and aesthetic design.  There is not much competition at this price level, other than Redmi K20 Pro (review) and Redmi K20 (review), which could be an advantage for Samsung.



Samsung Galaxy A51 design

The Samsung Galaxy A51 chassis has a design similar to that of the Galaxy A50s.  We have a polycarbonate body, somewhat light at just 172 grams, and also extremely slim, only 7.9mm thick.  The glossy body tends to capture fingerprints but is not visible on our Prism Crush Black unit.  The back finish is a little bit slippery, but fortunately Samsung provides a case in the box.

   The biggest change is the Infinity-O screen, which we are seeing for the first time on the Galaxy A-series.  It's basically one slot in the middle top of the screen, similar to what we saw in the Galaxy Note 10+ (review).  Samsung may not have changed the body design much, but having a perforated screen doesn't give this phone a premium look, which we appreciate.  Galaxy A51 uses Super AMOLED panel with full HD resolution, which produces great colors and good unit.  It looks stunning from the front, thanks to the thin bezels everywhere.

Samsung Galaxy A51 cameras

Samsung added a new 5 MP macro camera to the three types of cameras that were present on the Galaxy A50s.  It includes a 48-megapixel primary sensor; a 12-megapixel wide-angle camera; and a 5-megapixel depth sensor.

Samsung Galaxy A51 performance and battery life
Galaxy A51 is very similar to the Galaxy A50 when it comes to everyday use.  The slim and light shape factor is something we really liked.  Switching between the interface was relatively fast, but it was not very fluid.  There were some cases when we noticed some delay in the system animation.  The benchmark performance was decent, similar to what Qualcomm Snapdragon 660 or 665 SoC could achieve.  Despite Samsung's asking price for this phone, it's a little disappointing.


  At AnTuTu, we got a score of 1,86,220 points, while in GFXbench's T-Rex test, we passed 42fps.  The back of the phone appeared somewhat warm when playing games and running exhausting apps, but it didn't happen uncomfortably.  Thankfully, Exynos 9611 SoC is pretty competent in graphics.  PUBG Mobile and Asphalt 9: Legends have worked really well, with good frames.
Biometric authentication works well, but is a little slow.  It takes some time for the fingerprint sensor on the screen to authenticate you and unlock the phone, the same story with facial recognition.


  Galaxy A51 supports Dolby Atmos but only if you have wired headphones connected.  The sound quality is strictly average with the bundled headphones, but this phone looks better with a higher degree of headphones after the market.  The subwoofer is not loud, but it is enough for personal listening.  The screen is one of the best aspects of this phone.  The brightness is very good and the colors look vibrant, which makes watching any content very enjoyable.

  Samsung has used a 4000 mAh battery for the Galaxy A51 and has posted a decent 14-hour and 55-minute runtime in HD video loop testing.  We easily achieved regular day-to-day use, with enough energy to take you for another half-day.  There is a quick charge, and we managed to charge the battery to 67 percent in an hour.  It took just over two hours to fully charge it.  It's relatively fast, but not as fast as others in the industry like the Redmi K20 Pro, which charges up to 80 percent in an hour.