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Asus ZenFone 4 A400CG
Asus ZenFone 4 A400CG
Asus ZenFone 4 A400CG
Asus ZenFone 4 A400CG

Informr score
The Asus ZenFone 4 A400CG currently has an Informr score of 6.3 out of 10. This score is based on our evaluation of 6 sources including reviews from users and the web's most trusted critics.

What's good

  • Ergonomic and manageable sized screen
  • Smooth performance
  • Quality construction and materials
  • Good camera for the price

What's bad

  • Poor battery life
  • Poor viewing angles
  • No flash
  • No LTE connectivity

The Asus Zenfone 4 is Asus's first attempt at a basic budget smartphone. At 4.9 x 2.4 x 0.4 inches, the Zenfone 4 is downright small compared to many of its competitors. Reviewers point out that the petite size combined with the curved, soft-touch back panel make this a very ergonomic and manageable phone. They add that while the device is made entirely of plastic it is well constructed and has a nice heft that makes it feel more premium than it actually is.

In a market saturated with 5-inch+ displays, the Zenfone 4 sports a comparatively small 4-inch LCD screen. In order to stay in-line with the budget price, the display doesn't have the best resolution around at 480x800, but thanks to its small size it still manages a respectable 233ppi pixel density. For the most part, the screen delivers a solid experience with critics pointing out the fairly accurate and vivid colors. They mention, however, that the screen suffers from contrast shift when viewing it at different angles and poor bright light legibility.

With a 1.2GHz dual-core processor and 1GB of RAM, the Zenofone 4 isn't going to wow anyone with its blazing speed. Still, it is powerful enough that experts had no problem performing routine tasks like browsing web pages, navigating the home page and launching apps. The 1GB of memory is on the higher side for phones in this category and allowed critics to have several apps in the background without a significant hit to performance. The device also comes with 8GB of internal storage and an expandable microSD slot. Sadly, it does not come with 4G LTE connectivity.

Despite its fairly solid performance, the one drawback of the phone is its poor battery life. The 1600mAh battery barely lasted reviewers a full day of standard web browsing and use. When they put video streaming into the mix, it only lasted a mere 3 hours. Luckily, the battery pack is removable so users can have a spare charged pack on hand if necessary.

For its price-range, critics were sufficiently happy with the 5MP rear camera. It comes packed with a slew of different modes like: HDR, Selfies, Panorama, Beautification and Smart Remove, which are generally reserved for higher-end devices. For the most part, reviewers were very happy with the image quality in good lighting situations though Recombu noticed some blurring and color inaccuracy. They were also fairly impressed with low-light pictures, though the lack of flash makes it impossible to take photos in extremely dark situations.

Although experts bemoan the battery life, overall they were pleasantly surprised with the Zenfone 4. NDTV states, "…the Zenfone 4 is a fantastically capable device…" Gearbun adds, "…the Zenfone 4 is one of the best Android smartphones to be released in recent times…"

Operating system
Operating system
1.2 GHz
1.2 GHz
Screen Size
Screen Size
5+ MP
5+ MP
1200 mAh

What the Critics Are Saying...


The Asus Zenfone 4 packs lots of features into a tiny package. But the budget price means that the phone has cut corners, which is evident in the low-resolution display and underpowered processor and camera. Yet, there’s lots to like about the Zenfone 4: the design and the build quality is one...

- Alina Lewis, tech2
Tech Advisor
Tech Advisor

For £99, we're impressed by the ZenFone 4. It's nicely designed, has brilliant software features, is suitably speedy and has decent battery life, but it's not outstanding. We'd like to see a slightly better camera and the addition of 4G connectivity.We'd suggest checking out the EE Kestrel and...

- Ashleigh Allsopp, Tech Advisor

The Asus Zenfone 4 is a dinky but highly usable Android phone boasting strong performance but sadly woeful battery life.

- Chris Barraclough, Recombu
Fone Arena
Fone Arena

The Asus Zenfone 4 is a good device and offers more in terms of build quality, attractive UI and storage space considering the low price tag. 1 GB RAM does result into medium multi tasking up to some extent which is a surely one of the plus points of the phone. However, we feel that it could have of...

- Sneha Bokil-Paranjape, Fone Arena

The Zenfone 4 might be cheap, but it's no slouch when it comes to performance.

- Jamshed Avari, NDTV

Prices (Where to Buy)

Common Questions

We've got you covered! Download a free PDF copy of the Asus ZenFone 4 A400CG user manual here.

Asus backs up the ZenFone 4 A400CG with a 1 Year parts & labour warranty.

If your ZenFone 4 A400CG has problems and is still within its warranty period, you could contact Asus support or the retailer you purchased the phone from. You'll find Asus's contact information here. If your phone is off warranty and needs repair for a physical problem such as a broken screen or bad battery, you should visit an authorized service centre or a local phone repair shop. You can also connect with others in The Informr Community Forum to find and share answers to questions.


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Quick view

Screen Size

The Asus ZenFone 4 A400CG's screen size is 4 inches with 480 x 800 pixels resolution.

1.2 GHz

There is a Intel Atom Z2520 Dual core 1.2 GHz processor (CPU).


The phone runs on the Android 4.3 Jelly Bean (Update Available: 4.4 KitKat) operating system (OS).

5+ MP

You can take photos with the phone's onboard 5+ MP camera.

There is also a secondary front facing camera with VGA (640 x 480) resolution.

8 GB

Internal memory is 8 GB. An external, MicroSD, MicroSDHC (up to 64 GB) expansion slot is available for increased storage capacity.


The phone is powered by a Lithium-Ion (Li-Ion), 1200 mAh battery. Asus's performance ratings are 720 minutes.

ZenFone 4 A400CG Specs

Release Date May 21, 2014
Regions Available United Kingdom
Operating System Android 4.3 Jelly Bean (Update Available: 4.4 KitKat)

Compare Android Smartphones

Processor Intel Atom Z2520 Dual core 1.2 GHz
Internal Storage 8 GB
Hearing Aid Compatible No
Noise Cancellation No
SAR Head: 1.04 W/kg
Body: 1.18 W/kg
Manufacturer Warranty 1 Year
Accessories Included USB Power Adapter, Manual, Standard Battery, Data Cable
Mobile / Cellular Data
Push-to-talk (PTT) No
Wi-Fi Calling Unknown
Voice over LTE (VoLTE) Unknown
SIM card size
Dual SIM Yes
USB Micro-USB 2.0
USB OTG Support No
Infrared No
Bluetooth 4.0
Bluetooth Profiles A2DP
Bluetooth Audio Codecs SBC, aptX
Wi-Fi 802.11 b/g/n
Mobile Hotspot Yes
Memory Expansion Slot Yes
Expansion Slot Info MicroSD, MicroSDHC (up to 64 GB)
Data Tethering Compatibility Yes
Main Camera
Resolution / Aperture
5+ Megapixels
Additional Rear Camera Info
Face detection, Geotagging, ISO, Self-timer, White balance, Exposure value, Burst shot
Video Recording Formats
3GP / 3GPP, H.264 / AVC, MPEG-4
Video Recording Parameters
Full HD (1920 x 1080 pixels), 30 fps
Front Camera
Resolution / Aperture
VGA (640 x 480)+ Megapixels
Additional Front Camera Info
Video Recording Parameters
Display / Screen
Type Color
Technology LCD (TFT)
Colors 16.7 million
Resolution 480 x 800 pixels
Pixel Density 233 pixels
Size 4 inches
Secondary Display No
Sensors Proximity, Motion / Accelerometer
Multi-Touch Yes
Fingerprint-Resistant Coating No
Additional Display Features Capacitive touch screen
Power & Battery
Battery Type Lithium-Ion (Li-Ion)
Battery Capacity 1200 mAh
Removable Battery Yes
Wireless Charging No
Fast Charging No
Video Playback Time Up to 314 minutes
Internet Use (Wi-Fi) Unknown
Internet Use (Cellular) Unknown
Talk Time Up to 720 minutes
Standby Time Up to 8 days
Mixed Usage
Physical Characteristics
Design Type Bar
Material Plastic
Colors Charcoal Black, Pearl White, Cherry Red, Sky Blue, Solar Yellow
Dimensions [H x W x D] 12.4 x 6.1 x 1.1 cm (4.9 x 2.4 x 0.4 in)
Weight 115 grams
Water Resistant / Waterproof Unknown
Rugged design No
IP Rating No
Headset Jack 3.5mm
External Speakers Yes
Input / Navigation
Sleep / Wake Key Yes
Home Key Yes
Input / Keyboard Type Touchscreen
Navigation Type Touchscreen
External Volume Control Yes
Fingerprint Sensor No
Additional Information Other Names (AKA): Asus A400CG
Related Links Manual (PDF)
Asus ZenFone 4 A400CG Reviews
Where to buy Asus ZenFone 4 A400CG
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