Mobile Geeks

ASUS ZenFone 4 Pro Review – A class behind


A good looking phone that looks more midrange than high-end






ASUS ZenFone 4 Pro Specifications

  • 5.5-inch AMOLED
  • 1080 x 1920 pixels, 16:9 ratio (~401 ppi density)
  • 70.3% screen-to-body ratio
  • Gorilla Glass 5
  • Qualcomm MSM8998 Snapdragon 835
  • Octa-core (4×2.45 GHz Kryo & 4×1.9 GHz Kryo)
  • Adreno 540
Internal StorageUFS 2.1  64/128 GB
Rear CameraDual 12 MP (f/1.7, 25mm, OIS, 4-axis, PDAF & laser AF) + 16 MP (50mm), 2x optical zoom, Sony IMX351 image sensor
Front Camera8 MP, f/1.9, 22mm, 1.4µm pixel size, phase detection autofocus, 1080p. Sony IMX319 image sensor
Operating SystemAndroid Oreo 7.1 (Oreo Update confirmed), Asus ZenUI 4.0
BatteryLi-Ion 3600 mAh battery – Quick Charge
  • Slot 1: 2G/3G/4G Nano SIM card

    Slot 2: 2G/3G/4G Nano SIM Card, or the MicroSD card (supports up to 2TB) at a time

    Both SIM card slots support 3G WCDMA / 4G LTE network band. But only one SIM card can connect to 3G WCDMA / 4G LTE service at a time.

  • LTE Cat12: UL 100 Mbps / DL 600 Mbps World wide version

    LTE Cat12: UL 150 Mbps / DL 600 Mbps (US/CA/BR/CO/JP/IN version)

    FDD-LTE (Bands 1, 2, 3, 4, 5, 7, 8, 17,19, 20, 28)

    TD-LTE (Bands 38, 39, 40, 41 (2545~2655MHz))

  • WiFi: 802.11 a/b/g/n/ac
  • Bluetooth®: BT 5.0
  • NFC: Ja
  • WiFi direct
  • USB-Anschluss: USB Type-C™ 3.1
  • USB-Funktionen: Aufladung, MTP, Tethering, DisplayPort, Audio, Power Delivery, OTG
  • Live fingerprint sensor (0.3 seconds unlock, supports 5 fingerprints)
  • Accelerator
  • E-Compass
  • Gyroscope
  • Proximity sensor
  • Ambient light sensor
  • RGB sensor, Laser sensor
  • 3.5mm headphone
  • 5-magnet speaker with TI Smart Amp for up to 40% better performance
  • Hi-Res audio 192kHz/24-bit standard that is 4 times better than CD quality
  • DTS (Digital Theater System) Headphone:X™ 7.1 virtual surround sound for headphone support
Weight175 Gramm
Dimentions156.9 x 75.6 x 7.6 mm
  • Glasrückseite
  • Dual-SIM
  • Kein Wireless Charging
IWhat’s in the Box
  • ZenFone 4 Pro

  • ASUS ZenEar Pro earphone with microphone

  • Type-C USB cable

  • Ejector pin (SIM tray needle)

  • USB power adapter (18W)

  • Documentation (user guide, warranty card)

  • Clear soft bumper (optional)


ZenFone 4 Pro, you get the same main camera behind a brighter f/1.7 lens, but this time the second camera does 2X optical zoom. Again, the secondary camera isn’t as good in low light — a common thing for dual-lens phones — with its f/2.6 lens. But you do at least get a hardware-enabled portrait mode in the ZenFone 4 Pro.

PixelMaster camera modes:
Auto (with low light and HDR features)
Selfie Panorama
GIF Animation
9 various filters
Video Recording
4K UHD (3840 by 2160) video recording at 30 fps for rear camera’s shake-free videos
1080p FHD video recording at 30 / 60 fps
720p HD video recording at 30 fps
3-axis electronic image stabilization for selfie and rear cameras
Slow Motion video (1080p at 120 fps / 720p at 240 fps)
Take still photo while recording video



Here are some sample photos:


2X Zoom

5X Digital Zoom

low light. photo quality quickly starts to degrade

2X Zoom looks more pixelated than good lighting conditions


Here are some low light samples, it performs well, the shutter speed is often very slow, even with HRD off, we’re disappointed because the Snapdragon 835 should be powerful enough for snappy low light performance.

These were taken in Pro mode and took several shots to reduce the noise. The ZenFone 4 Pro is capable of decent low light photos, just not in Auto.

Photo take in Auto at in a bar, if you’re looking for a low light point and shoot, this isn’t the phone for you.

The dual lens set up also allow for a portrait mode, in normal lighting it is acceptable, the edges are fairly accurate. However, we should note that what you see in the preview is way worse than what the photo looks like. This makes the phone feel much less premium and much more midrange, these kinds of UX details are what is starting to separate the top tier from the midrange.

Portrait mode in low light is very slow, so slow that I decided to include a sample photo of holding the phone for 3 seconds, thinking it was done and then realizing that it wasn’t. If there isn’t enough light the software has a hard time differentiating the edges and the results are not great. All phones have this problem, but most give you an indication that the photo is still being taken.

22 hours on a plane to Valencia, I looked much worse in person. Beauty settings on 25% strength.





The dual-speakers aren’t good enough for serious music listening, but they’re clear and loud enough for some Netflix action. The addition of hi-res audio and DTS Headphone:X support are also a bonus for audiophiles and serious movie fans who want to experience virtual surround sound.




Game Genie

Apart from the camera lagging in low light, the ZenFone 4 Pro is a snappy beast.

PCMark Work 2.07462
Geekbench single1902
Geekbench multicore6203
GFX Bench T Rex Offscreen
GFX Bench Offscreen


The ASUS ZenFone 4 Pro is currently available on Amazon for $799 which is too expensive for a handset with an outdated design. The large bezels at the top and bottom combined with the average low light camera performance make this seem like it should have more a midrange price tag rather than a high end one. When you compare the Samsung Galaxy S8 or LG G6 which both have sleeker designs and better cameras.