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Asus Zenfone 2 ZE551ML

alaTest has collected and analyzed 6228 reviews of Asus Zenfone 2 ZE551ML. The average rating for this product is 4.1/5, compared to an average rating of 4.1/5 for other Cell phones for all reviews. People really like the portability and screen. The usability and price also get good feedback, whereas opinions about the connectivity and reception are different.

performance, price, usability, screen, portability

We analyzed user and expert ratings, product age and more factors. Compared to other Cell phones the Asus Zenfone 2 ZE551ML is awarded an overall alaScore™ of 91/100 = Excellent quality.

Review analysis

(Based on 6228 reviews)

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Consumer review by: ( review summary for Asus Zenfone 2 ZE551ML


alaTest has collected and analyzed 53 user reviews of Asus Zenfone 2 ZE551ML from The average user rating for this product is 4.3/5, compared to an average user rating of 4.1/5 for other Cell phones on Opinions about the battery and screen are overall positive. The usability and price are also mentioned favorably. Many are critical about the GPS navigation.

performance, price, usability, screen, battery

GPS navigation

87% of the reviews on give this product a positive rating.

This summary is based on the products: ASUS ZenFone 2 ZE551ML 4G LTE Dual SIM SIM-Free Smartphone (4GB RAM/64GB ROM) (Gold)ASUS ZenFone 2 ZE551ML 4G LTE Dual SIM SIM-Free Smartphone (4GB RAM/64GB ROM) (Gold)

Jan, 2018

Consumer review by: ( review summary for Asus Zenfone 2 ZE551ML


alaTest has collected and analyzed 2843 user reviews of Asus Zenfone 2 ZE551ML from The average user rating for this product is 4.0/5, compared to an average user rating of 3.8/5 for other Cell phones on Reviewers are impressed by the screen and portability. The usability and price also get good reviews. There are some mixed comments about the apps and reception, while there are some negative comments about the connectivity and reliability.

performance, price, usability, portability, screen

reliability, connectivity

82% of the reviews on give this product a positive rating.

This summary is based on the products: ASUS ZenFone 2 5.5-Inch 16 GB Smartphone - Unlocked (Silver)ASUS ZenFone 2 5.5-Inch 16 GB Smartphone - Unlocked (Silver)

Jan, 2018

Consumer review by: ( review summary for Asus Zenfone 2 ZE551ML


alaTest has collected and analyzed 32 user reviews of Asus Zenfone 2 ZE551ML from The average user rating for this product is 4.4/5, compared to an average user rating of 3.9/5 for other Cell phones on People really like the sound and durability. The screen and price also get good opinions, but the reliability and portability get negative opinions.

performance, price, screen, durability, sound

portability, reliability

91% of the reviews on give this product a positive rating.

This summary is based on the products: ASUS ZENFONE2 5.5" Intel 2.3GHZ 4GB RAM 64GB Storage SilverASUS ZENFONE2 5.5" Intel 2.3GHZ 4GB RAM 64GB Storage Silver

Jan, 2018

Expert review by: Matt Swider (

Asus Zenfone 2 review


Android phone customizations on the very cheap

Inexpensive Android 5.0 phone ; Spacious display ; Lots of RAM ; Two SIM card slots ; Full of customization options

Cheap look and feel ; Dim screen ; Poor camera quality ; Weak power button

Asus Zenfone 2 is a cheap way to upgrade to an Android 5.0 Lollipop phone, housing a 5.5-inch display and solid specs to boot. But a dull screen, plastic design and poor camera hold this handset back.

Jul, 2015

Expert review by: Michael Sawh (

Asus ZenFone 2 Deluxe


Asus announced the ZenFone 2 at CES back in January and its headline-grabbing feature was the fact it was the first smartphone to pack an impressive but seemingly unecessary 4GB of RAM. Nine months later and the ZenFone 2 Deluxe is taking the very same...

Sep, 2015

Expert review by: Edward Chester (

Asus ZenFone 2


Hands-on: The world's first smartphone with 4GB RAM

The ZenFone 2 looks set to be a very good choice for those wanting a large, relatively premium handset without spending megabucks. It’s attractive looking and comfortable to use and its feature set is very well balanced for its price point. Definitely...

Jan, 2015

Expert review by: Tein Hee Seow (

Asus Zenfone 2 hands-on review


Asus' latest Android smartphone is an affordable beast

Jan, 2015

Expert review by: Adam Shepherd (

Asus smartphone first look - Zenfone 2 Deluxe & more


We look at Asus' avalanche of new devices, including the Zenfone Selfie, Zenfone Zoom and Zenfone 2 Deluxe

Sep, 2015

Expert review by: Gadjo Cardenas Sevilla (

Review: ASUS ZenFone 2


The Asus ZenFone 2 is clearly designed as the company's best vision for a modern Android smartphone. That they have managed to make it affordable and available contract-free, really shakes up the market and puts the ZenFone 2 at the very top tier of...

With the 64GB version, it's not an imperative to want to delete many of these apps. For the most part, you can simply place them in their own folder and ignore them if you don't like them.

Jun, 2015

Expert review by: Raymond Wong (

Asus ZenFone 2: A super fast $300 Intel Atom-powered Android phone [REVIEW]


For $300, the Asus ZenFone 2 gets you super fast performance, a nice 5.5-inch screen, all day battery life and two SIM card slots.

Fast, smooth operating system ; Powerful Intel Atom processor ; Tons of RAM ; Display has really wide viewing angles ; Long battery ; Dual SIM cards

Weak camera, Weird power button location ; Outdated ZenUI launcher ; Somewhat bulky design ; Display isn't bright enough

For $300, the Asus ZenFone 2 gets you super fast performance, a nice 5.5-inch screen and all day battery life.

May, 2015

Expert review by: Nimish Sawant (

Asus Zenfone 2 review: Most things handled well, despite heavy skin; but a disappointing camera - Tech2


We review the world's first phone sporting 4GB RAM - Asus Zenfone 2

Asus Zenfone2 presents a good overall package with high performance numbers. But the excessive bloatware can be a concern for many buyers. While Asus may think it is adding value for its users, not everyone likes unnecessary software shoved down their...

Aug, 2015

Expert review by: Allen Ngo (

Asus ZenFone 2 Smartphone Review


4 GB of RAM! We all knew it was inevitable, but it's finally here -- the first major consumer smartphone with 4 GB dual-channel DDR3 RAM. Not only that, but it can also be had for just $300. Is this 5.5-inch monster enough to lure users away from...

Attractive design, Massive 4 GB of RAM, Fast system performance, 1080p IPS display with high contrast, Dual-SIM support, Rigid chassis, Clear speaker and reception

Faux brushed metal; Plastic and polycarbonate materials, Thicker than competing 5.5-inch models, Below average battery life, Average display brightness, No CDMA version, Soft pictures from camera, No USB 3.0 or MHL, Non-removable battery

For a $200 to $300 smartphone, the ZenFone 2 makes a strong case against more expensive 5.5-inch devices, especially from a design and performance standpoint. The device itself is physically quite large, though no less difficult to grip and use. It's...

Jun, 2015

Expert review by: Maurizio Pesce (

Review: Asus Zenfone 2


The newest massive Android phablet from Chinese manufacturer Asus takes the idea of a "computer in your pocket" quite seriously.

Snappy and rare high-end Intel processors and plenty of RAM. Handy gestures can launch specific apps from standby. Fully customizable skin. Ultra-cheap, considering what you get. Comes with 5GB of free cloud storage forever, and 100GB of Google Drive...

Large bezels, poor choice of materials, and too large of a body. So much plastic! Heavy, hard to work with one hand. Capacitive buttons are not illuminated. Comes with a ton of redundant apps that are a chore to get rid of

Jul, 2015

Product Specifications


Battery Capacity:2500 / 3000
Battery technology:Lithium Polymer (LiPo)
Standby time (2G):315
Standby time (3G):294 / 360 / 467.74
Standby time (4G):267
Talk time (2G):28 / 28.5
Talk time (3G):19 / 25.78

Call management

Call blocking: Yes
Call divert:Y / Yes
Call hold:Y / Yes
Call timer:Y / Yes
Call waiting:Y / Yes
Caller ID:Y / Yes
Conference call:Y / Yes
Speakerphone:Y / Yes
Speed dialing:Y / Yes
Vibrating Alert:Y / Yes


Auto Focus:Y / Yes
Built-in Flash:Y / Yes
Flash type:LED
Front Camera:Y / Yes
Front camera resolution (numeric):2 / 5
Front camera type:Single camera
Main camera resolution (numeric):13 / 8
Night mode: Yes
Rear camera resolution (numeric):13 / 8
Rear camera type:Single camera
Second Camera: Yes
Second camera resolution:2 / 5
Second rear camera resolution (numeric):5
Sensor Type:BSI
Video recording:Y / Yes
Video recording modes:720p,1080p
Zoom capability:Y / Yes


Colour of product:Black / Black, Blue / Black, Carbon / Blue / Gold / Grey / Purple / Red / Silver / White
Curved Design: No
Form factor:Bar
Low halogen options available: Yes
Standard colour:Black / Purple / Red / Silver


Aspect Ratio:16:9
Display diagonal:12.7 / 14 / 15.2
Display Resolution:1280 x 720 / 1920 x 1080
Display Type:IPS
Orientation sensor:Y / Yes
Pixel density:403
Screen shape:Flat
Second display:N / No / Yes
Touch screen: Yes
Touch screen type:Capacitive
Touch technology:Multi-touch
Touchscreen:Y / Yes
Touchscreen Type:Capacitive


Accelerometer:Y / Yes
Ambient light sensor:Y / Yes
Gyroscope:Y / Yes
Proximity sensor:Y / Yes


Internal RAM:2 / 4


Chat:Y / Yes
E-mail:Y / Yes
Instant messaging (IM):Y / Yes
MMS (Multimedia Messaging Service):Y / Yes
Short Message Service (SMS):Y / Yes


Audio formats supported:AAC, AMR, MP3 / AAC, MP3, WAV / AAC, MP3, WMA / AAC, MP3, WMA, WMV / AAC, WMV, MP3 / MP3 / Yes
FM radio:Y / Yes
Image formats supported:BMP, JPG, PNG / JPG
Supported video modes:1080p
Video compression formats:3GP, H.262, H.263, MPEG4, VP8
Video formats supported:3GP, AVI, FLV, MKV, MOV, MP4 / 3GP, H.262, H.263, MPEG21, VP6, VP8 / 3GP, H.263, H.264, MPEG4, MPEG4-SP, VP8, VP9 / 3GP, H.263, H.264, MPEG4, VP8, VP9 / XviD


Assisted GPS (A-GPS):Y / Yes
Electronic compass:Y / Yes
GPS: Yes
GPS (satellite):Y / Yes
Position location:Y / Yes


2G bands (primary SIM):850,900,1800,1900 / 900,1900,850,1800
2G bands (secondary SIM):850,2100,900,1900 / 850,900,1800,1900
3G:Y / Yes
3G bands supported:850,900,1700,1800,1900,2100 / 850,900,1900,2100 / 900,1900,850,2100
4G:Y / Yes
4G bands supported:1700,1800,1900,2100 / 1900,2100 / 700,800,850,900,1700,1800,1900,2100,2300,2500,2600 / 700,800,850,900,1700,1800,1900,2100,2300,2600 / 700,800,850,900,1700,1800,1900,2100,2600 / 700,800,850,900,1800,1900,2100,2600 / 700,900,1900,2600,800,1700,2100,850,1800 / 700,900,1900,800,1700,2100,850,1800 / 800,850,900,1700,1800,1900,2100,2600 / 800,900,1700,1800,1900,2100,2600 / 850,1700,1800,1900,2100,2600
4G standard:LTE
4G standards:LTE
Bluetooth:Y / Yes
Bluetooth profiles:A2DP
Bluetooth version:4.0 / 4.0 EDR / 4.0 LE / 4.1+EDR
Near Field Communication (NFC):Y / Yes
SIM card capability:Dual SIM / Single SIM
SIM card type:MicroSIM
Tethering (modem-mode):Y / Yes
Wi-Fi:Y / Yes
Wi-Fi standards:802.11a, 802.11ac, 802.11ad, 802.11b, 802.11g, 802.11n / 802.11a, 802.11ac, 802.11b, 802.11g, 802.11n / 802.11a, 802.11g, 802.11ac, 802.11b, 802.11n / 802.11b, 802.11g, 802.11n / 802.11g, 802.11b, 802.11n / IEEE 802.11a, IEEE 802.11ac, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n / IEEE 802.11a,IEEE 802.11ac,IEEE 802.11b,IEEE 802.11g,IEEE 802.11n / IEEE 802.11b, IEEE 802.11g, IEEE 802.11n / IEEE 802.11b,IEEE 802.11g,IEEE 802.11n

Packaging Content

AC adapter included:Y / Yes
Bundled software:ZenMotion, ASUS Splendid, Kids Mode, SnapView, One Hand Mode, Trend Micro™ Security, Power saving mode, PhotoCollage, PhotoEffects, MiniMovie, Google Apps, File Manager, Quick Memo, Themes, ZenCircle
Cables included:USB
Quick start guide: Yes
Warranty card: Yes


Accelerometer: Yes
Ambient light sensor: Yes
Flight mode:Y / Yes
General Purpose IO: Yes
Graphics & IMC lithography:22
Graphics adapter:Intel® HD Graphics
Gyroscope: Yes
Low halogen options available: Yes
Microphone mute:Y / Yes
Number of Displays Supported:2
Number of displays supported (on-board graphics):2
On-board graphics adapter model:Intel® HD Graphics
Operating system installed:Android
Operating System Version:5 / 5.0 / 5.0 (Lollipop)
Personal info management (PIM):Alarm clock, Calculator, Calendar / Alarm clock, Calculator, Calendar, Events reminder, To-do list / Alarm clock, Calculator, Calendar, Games / Alarm clock, Calculator, Calendar, Notes / Alarm clock, Calculator, Calendar, Notes, To-do list
Personalization:Icons, Menu, Shortcuts / Icons, Menu, Shortcuts, Themes, Widgets / Icons, Menu, Shortcuts, Widgets / Icons, Shortcuts, Themes / Icons, Shortcuts, Themes, Widgets
Proximity sensor: Yes
Subscription type:No subscription
Support for contact groups:Y / Yes
Video call:Y / Yes

Ports & interfaces

Headphone connectivity:3.5 mm
USB connector type:MICRO-USB / Micro-USB B
USB port:Y / Yes
USB version:2.0


64-bit computing: Yes
Conflict Free processor: Yes
Embedded options available: No
Execute Disable Bit:Y / Yes
Idle States:Y / Yes
Memory bandwidth supported by processor (max):12.8
Processor boost frequency:1.6 / 2.33 / 2.5
Processor cache:2
Processor cache type:Smart Cache
Processor Cores:2 / 4
Processor family:Intel Atom / Intel® Atom™ / Qualcomm Snapdragon
Processor frequency:1.6 / 1.8 / 2.3 / 2.33
Processor lithography:22
Processor Model:616 / Z2560 / Z3560 / Z3580 / Z3590
Processor operating modes:64-bit
Processor package size:14 / 14 x 14
Processor threads:4
Supported instruction sets:AES, SSE2, SSE3, SSE4.1, SSE4.2, SSSE3
Thermal Monitoring Technologies:Y / Yes

Processor special features

Enhanced Intel SpeedStep Technology:Y / Yes
Intel 64:Y / Yes
Intel AES New Instructions:No / Yes
Intel Hyper-Threading Technology: Yes
Intel Secure Key: Yes
Intel Smart Idle Technology:Y / Yes
Intel Virtualization Technology (VT-x):Y / Yes
Intel Wireless Display (WiDi) Technology: Yes
Intel® AES New Instructions (Intel® AES-NI):N / No / Y / Yes
Intel® Hyper Threading Technology (Intel® HT Technology):Y / Yes
Intel® Secure Key:Y / Yes
Intel® Wireless Display (Intel® WiDi):Y / Yes


Operating system installed:Android
Operating System Version:5 / 5.0 / 5.0 (Lollipop)


Compatible memory cards:MicroSD (TransFlash) / MicroSD (TransFlash), MicroSDHC, MicroSDXC / MicroSD (TransFlash), MicroSDXC
Internal RAM:2 / 2048 / 4 / 4096
Internal RAM type:LPDDR2 / LPDDR3
Internal storage capacity:128 / 16 / 32 / 64 / 8
Maximum memory card size:128 / 64 / 65
RAM capacity:2 / 3 / 4
USB mass storage:Y / Yes


Subscription type:No subscription

Technical Details

Google applications:Google Play


Video call: Yes

Weight & Dimensions

Depth:1.09 / 10.6 / 10.9 / 14.8 / 148.1 / 15.2 / 152.5 / 7.15
Height :1.09 / 10.9 / 14.8 / 15.2 / 15.3 / 152.5 / 164.6 / 3.9
Weight:155 / 170 / 190
Width:14.8 / 7.15 / 7.72 / 71.5 / 77.2 / 84