Samsung Galaxy A40 review

GSMArena team, 30 April 2019.

Infinity-U Super AMOLED display on a budget

As we already mentioned, the screen is one of Galaxy A40's key selling points - SuperAMOLED panel, which is a rare Pokemon in around these parts of the market. It's also one of the few compact devices to have one, too.

The screen measures just 5.9" in diagonal and packs a sufficient amount of pixels - 1080 x 2340 pixels resolution. The aspect ratio is extra tall - 19.5:9 and the pixel density is around 437 ppi. The rather small U-shaped notch on the top is indeed a bit deep but it's not wide, which is more important. You can get used to it really fast and it's not as obtrusive.

Samsung Galaxy A40 review

The results from our tests say that the Galaxy A40's panel isn't too shabby in terms of picture quality too. It scored 410 nits with the brightness slider cranked up to maximum and boosted up to 548 cd/m2 in Max Auto mode. Sunlight legibility is excellent and rarely matched at this price range.

Display test 100% brightness
Black, cd/m2 White, cd/m2 Contrast ratio
Xiaomi Redmi Note 7 0.358 479 1338
Samsung Galaxy A40 0 410
Samsung Galaxy A40 (Max Auto) 0 548
Samsung Galaxy A50 0 424
Samsung Galaxy A50 (Max Auto) 0 551
Nokia 7.1 0.377 490 1300
Nokia 7.1 (Max Auto) 0.465 600 1290
Huawei Honor 10 Lite 0.344 441 1282
Motorola Moto G7 0.315 493 1565

Color accuracy is impressive too - dE2000 is just 1.9 in the default mode and goes up to 3.1 and 3.9 in cinema and photo modes. These results are typical for a higher-priced handset. Essentially, you won't be able to tell the difference between input and output colors.

Battery life

Battery life is definitely not one of the strongest suits of the Galaxy A40 but it's not necessarily a weak point either. The 3,100mAh unit didn't deliver the runtimes we expected, especially in the web browsing and video playback tests. Still, an overall 73h endurance rating is fairly dependable so you will probably squeeze out a full day of moderate usage.

Samsung Galaxy A40 review

Our battery tests were automated thanks to SmartViser, using its viSer App. The endurance rating above denotes how long a single battery charge will last you if you use the Samsung Galaxy A40 for an hour each of telephony, web browsing, and video playback daily. We've established this usage pattern so that our battery results are comparable across devices in the most common day-to-day tasks. The battery testing procedure is described in detail in case you're interested in the nitty-gritty. You can check out our complete battery test table, where you can see how all of the smartphones we've tested will compare under your own typical use.


The phone has a single bottom-firing speaker, which is a standard for phones in this price range. However, we can't call it loud as our tests show that it's considerably quieter than the competition. It might have something to do with the size of the handset but we can't be entirely sure.

Speakerphone testVoice, dB Pink noise/ Music, dB Ringing phone, dB Overall score
Samsung Galaxy A40 66.2 68.3 73.6 Good
Samsung Galaxy A50 68.9 71.3 82.7 Very Good
Moto G7 (Smart Audio) 70.2 71.9 84.6 Very Good
Huawei Honor 10 Lite 70.0 73.8 87.0 Excellent
Xiaomi Redmi Note 7 69.8 71.5 90.5 Excellent
Nokia 7.1 75.6 76.0 81.1 Excellent

Audio quality

The Samsung Galaxy A40 did splendidly in the first part of our audio quality test. When hooked to an active external amplifier, it delivered a perfectly accurate output and with high volume levels and perfect clarity marks.

Hеadphones degraded the volume to just above average and introduced some intermodulation distortion. It also caused a moderate hike in stereo crosstalk and when you add it all up we can only give an average mark.

TestFrequency responseNoise levelDynamic rangeTHDIMD + NoiseStereo crosstalk
Samsung Galaxy A40+0.03, -0.05-
Samsung Galaxy A40 (headphones)+0.30, -0.17-
Samsung Galaxy A50+0.03, -0.06-93.493.20.00090.0082-92.3
Samsung Galaxy A50 (headphones)+0.30, -0.12-
Sony Xperia 10+0.04, -0.04-
Sony Xperia 10 (headphones)+0.05, -0.03-
Motorola Moto G7 Plus+0.04, -0.00-93.393.20.00290.0077-93.8
Motorola Moto G7 Plus (headphones)+0.07, -0.01-92.993.20.0150.076-68.8
Redmi Note 7+0.04, -0.04-90.790.70.00150.014-94.5
Redmi Note 7 (headphones)+0.05, -0.29-92.592.50.0240.296-55.0
Honor 8X+0.01, -0.04-92.392.40.00410.0085-80.7
Honor 8X (headphones)+0.45, -0.54-

Samsung Galaxy A40 frequency response
Samsung Galaxy A40 frequency response

You can learn more about the tested parameters and the whole testing process here.

Reader comments

  • Frank
  • 30 Mar 2024
  • r3a

Can I see a40 with 128gb rom

Exactly, had the same problem, a can of compressed air solved it (also for 3.5 mm jack).

  • Saint
  • 27 Jul 2023
  • fuv

It’s not water resistant if so how can I get phone back on