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ASUS Zenfone 4 Review


The new Zenfone 4 lineup of smartphones from ASUS has definitely made waves as a set of devices that meet today’s standards, in different categories. Today we take a look at the titular character of the series, the mainstream flagship ASUS Zenfone 4. The particular configuration of the Zenfone 4 we’ll be taking a look at for this review packs a Snapdragon 660 8-core processor, Adreno 512 GPU, 6GB of RAM, and 64GB of storage. Let’s dive in.

Asus Zenfone 4 Product Shot 15 • Asus Zenfone 4 Review

Table of Contents

Design and Construction

Right away, you’ll notice that the overall look and feel of the device is more premium, compared to the Zenfone 4 Max, Selfie, and Selfie Pro. It has an aluminum unibody design, and both the front and back are covered in 2.5D Corning Gorilla Glass. The phone is reasonably thin, but feels quite solid. From the moment I first picked it up, it felt much better in my hands than my LG G5.

Asus Zenfone 4 Product Shot 2 • Asus Zenfone 4 Review

The 5.5-inch Full HD Super IPS display up front is nicely accentuated by slim side bezels and is accompanied by the 8MP front camera and call speaker above, and the LED lit capacitive navigation buttons down below. The home button here also doubles as a fingerprint scanner.

Asus Zenfone 4 Product Shot 12 • Asus Zenfone 4 Review

Flip it on its back, and you’ll find the 12MP+8MP dual rear cameras, LED flash, and of course the ASUS logo. Unlike the rear of the Zenfone 4 Max, Selfie, and Selfie Pro, this one doesn’t have visible antenna bands. The back is actually my favorite part of the phone, as it just looks and feels so premium.

Asus Zenfone 4 Product Shot 9 • Asus Zenfone 4 Review

On the right side are the volume rocker and power button, while the left side houses the hybrid SIM tray.

Asus Zenfone 4 Product Shot 10 • Asus Zenfone 4 Review

Nothing much is up top, other than a noise-canceling microphone and a couple of antenna bands. Down at the bottom are a USB Type-C port, headphone jack, call microphone, and the speaker.

Asus Zenfone 4 Product Shot 7 • Asus Zenfone 4 Review

With its solid aluminum body, curved edges, and glass-covered front and back, the Zenfone 4 doesn’t just look good, it feels good to use. The rear especially though, is a fingerprint magnet, but ASUS also gives you a clear silicone soft case, just like with the Zenfone 4 Selfie.

Display and Multimedia

Just like the Zenfone 4 Selfie Pro, this one packs a Super IPS display. The 5.5-inch screen has a resolution of 1920 x 1080 @ 401ppi, again, like the Selfie Pro. Unlike the lower-end 720p displays of the Zenfone 4 Max and Selfie, the Zenfone 4’s screen is crisp, has good contrast, and has nice colors. It isn’t however, quite bright enough to have a good outdoor use experience.

Asus Zenfone 4 Product Shot 19 • Asus Zenfone 4 Review

As for the audio department, the speaker can get really loud, but a middle to upper middle level of volume would be recommended, as it tends to lose some details in the highs and mids at maximum volume. Bass is lacking, too. All in all, the since the speaker is loud, it’s great for hands-free calls and casual listening, even with friends.

OS, UI, and Apps

The device runs on Android 7.1.1 Nougat with ZenUI 4.0. If you’re fond of ZenUI, then you’ll like this improved version with less bloat and more responsiveness. It does look quite cartoonish at a certain point, but it still does look pretty clean.

Asus Zenfone 4 Os Apps Ui • Asus Zenfone 4 Review

Pre-installed apps aren’t that plentiful which is good and includes Facebook, Messenger, Instagram, the Google suite of apps, and some proprietary ASUS apps. Notable ASUS apps are Selfie Master, which features ASUS’ beauty mode for photos, videos, and live streams, and Mobile Manager for device monitoring and optimization.

Asus Zenfone 4 Os Apps Ui 2 • Asus Zenfone 4 Review

Out of the 64GB of total storage, 51.64GB is usable out of the box. If that’s still not enough, you can further expand this via microSD.

Realme Philippines


The Zenfone 4 sports 12MP+8MP dual rear cameras and an 8MP front camera. The main 12MP rear shooter has a Sony IMX362 sensor and has an aperture of f/1.8, and a field of view of 83-degrees. It features 4-axis OIS, PDAF, and a six-element lens. Meanwhile, the 8MP secondary shooter has a wide field of view of 120-degrees, and the 8MP front camera has an aperture of f/2.0.

Asus Zenfone 4 Product Shot 11 • Asus Zenfone 4 Review

There are a few modes available to you through ASUS PixelMaster, including a manual mode with a very wide shutter speed range of 1/10000s to 32s and a wide ISO range of 25 to 3200. Other modes are Portrait, which like the other Zenfone 4 variants, artificially blurs the background, Super Resolution mode, which gives you a photo with a resolution of 8064 x 4544, and Beauty Mode for removing blemishes on your subject’s face. You also get nine filters if you want to spice up your image a little bit.

Asus Zenfone 4 Camera Modes 2 • Asus Zenfone 4 Review  Asus Zenfone 4 Camera Modes 1 • Asus Zenfone 4 Review

The device features a Qualcomm Spectra 160 image signal processor which gives faster autofocus and clear photos with good color. Resulting photos are, in fact, clear, have good color, though dynamic range isn’t that good even with HDR mode turned on. Photos also get quite grainy in low-light situations despite the large aperture.

The main 12MP rear camera definitely outshines the secondary, which is quite expected. The difference is not by a lot, as you can still get some really nice landscapes and such with the secondary camera, but the change in quality is definitely there. The front camera, on the other hand, is definitely better suited for well-lit environments, though it definitely doesn’t capture as much details as other smartphones with better front cameras do.

As for video recording, the main rear camera can shoot up to 4K at 30fps, while the secondary rear and front cameras can only shoot up to Full HD. Resulting videos with the main camera are pretty good, and the secondary camera reaches its full potential when shooting outdoors. Like the other dual-camera setups we’ve seen so far in the Zenfone 4 series, you still don’t get to switch between the main and wide lenses while shooting.

Performance and Benchmarks

The Zenfone 4 comes in Snapdragon 630/Adreno 508/4GB RAM and Snapdragon 660/Adreno 512/6GB RAM flavors. As mentioned earlier, the one we’re using for this review is the latter. Our experience in gaming was a smooth one thanks to the 30% performance increase of the new chipset over its predecessor. Thanks to its large RAM capacity, multitasking and long periods of usage was excellently handled by the device.

Asus Zenfone 4 Benchmarks • Asus Zenfone 4 Review

The scores we got on our synthetic benchmarks were pretty good.

  • AnTuTu – 112,398
  • GeekBench – 1,617 (Single-Core), 5,780 (Multi-Core), 5,545 (RenderScript)
  • PC Mark – 6,250 (Work 2.0)
  • PC Mark Storage – 4,590
  • 3D Mark – 1,352 (Sling Shot Extreme)
  • Quadrant Standard – 30,127
  • AndroBench –  291.03 MB/s (Read), 217.1 MB/s (Write)

Connectivity, Call Quality, and Battery

Basic connectivity features are covered here, which includes WiFi, LTE, Bluetooth, GPS, and NFC. Call quality and mobile data usage both work as advertised, as long as you have good coverage. Even in the deepest parts of the Metro, GPS location services will not fail you when using navigation apps like Google Maps and GPS.

Asus Zenfone 4 Connectivity Call Quality • Asus Zenfone 4 Review

Giving juice to the Zenfone 4 is a 3,300mAh battery, which actually holds its own pretty well, thanks in part to the more efficient Snapdragon 660.

Asus Zenfone 4 Battery • Asus Zenfone 4 Review

The device does support fast charging through ASUS BoostMaster, and at a starting point of 0%, you can expect to reach full charge within 1 hour and 30 minutes. In our usual video loop test, the phone lasted a solid 13 hours and 30 minutes of continuous playback. In moderate to heavy real-world use, the Zenfone 4 can easily last you more than a day on a single full charge.


ASUS certainly did not let down with their mainstream flagship device, the titular character of the Zenfone 4 lineup. With its premium and classy design, up to date internals, Super IPS display, and good camera performance, the ASUS Zenfone 4 is certainly worthy of representing an entire series of smartphones.

Asus Zenfone 4 Product Shot 1 • Asus Zenfone 4 Review

The ASUS Zenfone 4 has a suggested retail price of Php28,995 and is available at ASUS concept stores.

ASUS Zenfone 4 (SD660) specs:
5.5-inch Super IPS display @ 1080 x 1920 pixels (401ppi)
Corning Gorilla Glass
64-bit Qualcomm Snapdragon 660
Adreno 512
64GB internal storage
Expandable up to 2TB via microSD (uses SIM 2 slot)
12 MP f/1.8 Sony IMX362+ 8MP wide angle dual rear cameras: OIS 4-axis, Dual Pixel PDAF with dual-LED flash
8MP f/2.0 front camera
Dual-SIM (nano)
Wi-Fi 802.11 a/b/g/n/ac
Bluetooth 5.0
Fingerprint scanner
USB Type-C
ASUS ZenUI 4.0 (Android 7.0 Nougat)
3300mAh non-removable battery
155.2 x 75.2 x 7.5 mm
165 g
Moonlight White, Mint Green, Star Black

What we liked about it:

  • Great premium design and build quality
  • Good display
  • Above average battery
  • Good rear camera performance
  • Snapdragon 660 & 6GB RAM

What we did not like:

  • Very prone to fingerprints and dirt
  • So-so front camera
  • Cannot switch between rear cameras during video recording


Avatar Of Joey Maceda

Joey is YugaTech's Video Production Manager. He constantly puts effort towards his aspirations to be a filmmaker and journalist... when he's not riding his bike, playing games on his PC, watching anime, cooking, and petting his dogs.

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A Seuss
A Seuss
4 years ago

Yes, it’s expensive but still way better than O*PO F3 Plus which has outdated chip but still as expensive as this

Easy E
Easy E
4 years ago

Get the LGG6 at this price.
Sorry ASUS, next year nalang ulit. Sobrang mahal naman kasi.

4 years ago

Is it really AMOLED? Asus websites states that it is Super-IPS. I think only the Pro (as well as the Selfie Pro) version utilizes AMOLED.

Reply to  WilliamC
4 years ago

The Zenfone 4 Selfie uses IPS 720p screen,
the Z4 Selfie Pro uses 1080p AMOLED screen
the Z4 (unit reviewed above) uses 1080p Super-IPS
the Z4 Pro uses 1080p AMOLED

The line “like the Selfie Pro” in Display and Multimedia is incorrect. It could read “Just like the last year’s Zenfone 3 5.5 (Ze552Kl)” (since they seem to have the same resolution and size).

Asus nomenclature and numbering is confusing…

You can delete this post and the one above once correction had been made, as they will be irrelevant. Thanks!

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