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Asus Zenfone 2 ZE550ML Review

Asus is set to release the Zenfone 2 in the Philippines sometime in May so everyone is excited to see how the second generation will fare. In this article, we share with you the Zenfone 2 ZE550ML review.

The ZE550ML is the mid-range variant of the Zenfone 2 family — there’s the ZE500CL which is a 5-incher and then the ZE551ML which sports up to 4GB of RAM and a 2.3GHz quad-core processor.

We will do a separate full review of the ZE500CL and the ZE551ML but for the purpose of this article, we’re basing our results on the ZE550ML variant.

Design and Construction

Asus continued to use their signature design and form factor from the original Zenfone 4, 5 and 6 and improved a little bit of that in the Zenfone 2. Hence, it’s pretty easy to confuse the Zenfone 2 from the Zenfone 5 or 6 if you’re not very familiar with the family. The most obvious giveaway for the Zenfone 2 would be the rear volume keys.

With a 5.5-inch display, the ZE550ML looks huge but still feels comfortable in the hands. It’s bigger than the G3 even though they have the same display size. The bezels are also quite thick at 3.3mm, despite Asus’ claims that it’s already narrow.

Based on our side-by-side observation the bezels are as thick (or slightly thicker) than the side bezels of the HTC One M8 and close to 3 times as thick as the 1.15mm bezel of the LG G3. The Android capacitive buttons are still there at the bottom end (Back, Home, Recent Apps) which should have been already replaced by one-screen buttons due to Kitkat/Lollipop UI implementation.

Build quality is really good, feels solid on the hands with a comfortable grip thanks to that curved back; not too heavy or bulky either. The back cover is removable to expose access to the two micro-SIM card slots and a microSD card slot. The first SIM card slot supports up to 4G networks while the second SIM card slot only supports 2G networks.

The battery is visible but cannot be readily removed due to the card slots blocking the battery. The only way to remove is by loosening the screws around the back.

The power button is found at the top together with the 3.5mm audio port. The volume keys are at the back, just below the rear camera and dual-LED flash. The back cover has a smooth matte finish which can be prone to smudges with sweaty or oily fingers.

With it’s rather large size, it’s quite hard to use the Zenfone 2 with one hand so you’ll always end up texting using both hands. The placement of the rear key was inspired from the LG G2 and LG G3 and works as well especially when the device is this large. What’s a little odd is the placement of the power button at the top.

Display and Multimedia

The 5.5-inch IPS LCD display looks pretty good and surprisingly crisp and clear even with just an HD resolution. It’s quite hard to distinguish the difference in resolution even if you place it side-by-side other full HD smartphones.

There’s still some degree of outdoor visibility but the screen is also very reflective especially under direct sunlight. When indoors, cranking up the brightness at the lowest level is still comfortable and ideal brightness level would be around 70%. This means the display is still very usable even at lower brightness settings allowing you to conserve more battery life.

The display is also protected by a very tough Corning Gorilla Glass 3 in order to avoid the usual hairline scratches on the glass panel. Nevertheless, we think a lot of new owners would still put an additional tempered glass or protective film once they open their units out of the box.

The large screen is just about right when surfing the web, watching movies or playing games for a couple of hours.

The screen color mode allows you to change the color temperature of the display to your liking. There are also color presets like Balance, Reading, Vivid and a custom one you can save.

The loudspeakers at the back sounded good, has decent volume range but did not have bass in it. The four rows of pinholes for the loudspeaker is just for symmetry since opening the back cover will reveal the speakers to be smaller and flushed to the left side. The earphones that came with it are good too but nothing really spectacular about them.

OS, UI, and Apps

Asus did a pretty good job having Android 5.0 Lollipop with the Zenfone 2 right out of the box. Our review unit also had about 130MB worth of firmware updates downloaded via OTA right after we booted it up for the first time.

The Asus ZenUI looks simple yet really clean and nice with very little footprint so it feels light and almost bloatware-free. The pre-installed Zenlink collection includes PC Link, Remote Link, Share Link and Party Link. Of the 16GB internal storage, only 11.31GB is usable so you’ll be hard pressed to get an extra microSD card right for additional storage right away.

There are a few customizations and refinements introduced with the ZenUI. While you’re limited to a maximum of 7 home screens, you can customize the scroll effects, transitions and animations to your liking.

Even the Folders can be customized to various arrangements (2×2 grid, 3×3 grid, stack, fan, line or card). You can likewise download additional sets of icon packs if you don’t want the flat look of the default one. There are not a lot of native widgets though.

There’s an Easy Mode you can switch to in order to make the whole UI more simplified and accessible. The Zen Motion allows for gesture actions like “shake to screenshot” and “double tap to wake and sleep”.

There’s even that gesture motion on the screen where you can draw a specific letter to wake up the screen and immediately run an app or feature. The first time we saw that was with the Oppo Color OS. It’s quite apparent that Asus learned a trick or two from other vendors and incorporated them to the Zen UI.


Asus has been boasting its PixelMaster camera since the first Zenfone and the Zenfone 2 claims to have better optics, starting with the 13-megapixel rear camera.

We took notice that even the sensor on the Zenfone 5 can get good exposure even on low-light environments. That holds true with the Zenfone 2.

[fancygallery id=”196″ album=”238″]

Samples above show the 13MP rear camera of the Zenfone 2 takes really good photos in general with much better results in macro mode. Low-light photos appear brighter than usual, thanks to PixelMaster, but accuracy on focus is a hit or miss (we took 4 successive shots of the grill picture above and only 2 out of 4 in focus).

Video recording is equally good at full HD 1080p. There is video stabilization but that is limited to 720p resolution.

There are a lot of options to tinker around with the camera alone — from setting manual ISO between 50 to 800, exposure values form -2 to 2, anti-flicker from 50Hz to 60Hz, anti-shake enhancements and HDR.

Performance and Benchmarks

Running an Intel Atom Z3560 quad-core processor paired with 2GB of RAM worked well with Android 5.0 Lollipop. Navigation and transitions is smooth and snappy. Apps and games run just fine and multitab browsing on Chrome is effortless.

The Z3650 is a slightly newer Atom processor, launched in 2nd quarter of 2014. It has 4 cores, 4 threads and supports 64-bit operations and up to 4GB of RAM. Each core operates from 500MHz to 1.83GHz, depending on the load required.

Here are the test results of the benchmarks we ran on the unit:

Asus Zenfone 2 ZE550MLAsus Zenfone 2 ZE500CLAsus Zenfone 5 2.0GHz
Quadrant Standard18,9798,18211,033
Antutu Benchmark41,96823,23122,808
Vellamo2,985 (Chrome)1366 (Chrome)-
1,194 (Metal)646 (Metal)-
1,357 (Multicore)938 (Multicore)-
PCMark 8,594 (Ice Storm Unlimited)3,573 (Ice Storm Unlimited)-

After running a number of resource-intensive applications, the device gets a bit warm but nothing alarming of sorts. So far, even running 3DMark Ice Storm Unlimited and Epic Citadel only caused slight warming of the middle section of the back side.

Connectivity and Call Quality

One of the highlights if the new Zenfone 2 is the dual-SIM capability with LTE support. While only the first micro-SIM slot supports connectivity up to 4G, the second micro-SIM slot can only handle up to 2G.

LTE connectivity is pretty string with multiple speed tests on different locations yielding 13Mbps downlink speeds (using Smart LTE postpaid SIM). Calls are clear and crisp on both SIM cards while SMS handling for the dual-SIM functionality is very easy to get used to.

Unfortunately, this variant did not have the built-in NFC that the ZE551ML has but that’s not really a huge deal.

Battery Life

The Zenfone 5 has been heavily criticized before for having very poor battery life. This is mainly due to the architecture of the Intel Atom processor. So, it’s no surprise that a lot of peoplewill still be skeptic with the Zenfone 2 despite its generous 3,000mAh Li-Po battery.

As for battery life nominal tests, we managed around 8.5 hours on a full charge using our standard battery bench at 50% brightness and 0% volume playing an HD movie. We also got an almost similar 8:06 hours when we tested it with PCMark Battery Test at 50% brightness in Flight Mode.

The results are within the average range of other smartphones we’ve tested before but way better than the performance of the Zenfone 5.


It’s no secret Asus has generated a lot of interest in the Zenfone 2, fueled by their earlier success with the Zenfone 5 last year. The Zenfone 2 ZE550ML is a significant upgrade despite the fact that it’s not yet at the top of the line-up (wait ’til we get our hands on the ZE551ML).

It comes with a familiar and solid design, pretty good hardware with LTE support, all packed in a very price-conscious offering. We’re pretty sure Asus will be selling hundreds of thousands of these units once they become officially available this May.

Asus has once again proven that you can get a really good, solid smartphone at a very reasonable price without any compromise. The Zenfone 2 is a testament to that.

ASUS Zenfone 2 (ZE550ML) specs:
5.5-inch HD IPS display, 720×1280 pixels @ 267ppi
Corning Gorilla Glass 3
Intel Atom Z3560 1.8GHz 64-bit quad-core processor
PowerVR G6430 GPU
16GB internal storage
up to 64GB via microSD
13 megapixel Pixel Master camera w/ LED flash
5 megapixel front camera
WiFi 802.11 a/b/g/n
Bluetooth 4.0, A2DP, EDR
GPS with aGPS support, GLONASS
Android 5.0 Lollipop w/ ZenUI
Li-Ion 3,000mAh battery
152.5 x 77.2 x 10.9mm (dimensions)
170 grams (weight)

What we liked about it:
* Great performance
* Good camera
* LTE support
* Very affordable
* Android Lollipop out of the box
* Nice, simple ZenUI

What we did not like:
* A bit heavy and chunky
* Average battery life
* Non-removable battery

You might be interested in “What to expect: Zenfone 2 price, variants and release date.

Author’s Note: This review unit was sourced from Widget City (see listing here).

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Avatar for Abe Olandres

Abe is the founder and Editor-in-Chief of YugaTech with over 20 years of experience in the technology industry. He is one of the pioneers of blogging in the country and considered by many as the Father of Tech Blogging in the Philippines. He is also a technology consultant, a tech columnist with several national publications, resource speaker and mentor/advisor to several start-up companies.

21 Responses

  1. Avatar for logan logan says:

    Umiinit kahit naka stand by lang yung zenfone2 ko tapos ang bilis ma drain ng batt ayaw din gumana ng sim2 slot kahit i enable mo ayaw talaga more than a week pa lang unit ko..sa palagay niyo po ba factory defect to?

  2. Avatar for xander xander says:

    just a couple of days ago nung nabili ko 551ml ko and here are what i noticed. cons;
    1. the home,back and yong isa pang bottom sa baba ay walang light pag gabi. so meaning u have to be familiar kung nasaan ang locations ng mga ito.
    2.battery, just like other units specially samsung ang bilis ma drain ang battery nsa 7-8 hours lang.
    3.LCD is not as bright as amoled kahit nka full bright na sya
    no logs, the camera is 90% good kahit madilim dahil sa HDR nya. Zen UI is good also u can personalized apps and settings ayos sa preference mo and the best is you have a phone na cheap that works like G4 or S5 and other high end devices.

  3. Avatar for dani dani says:

    USB on the go na ba ang zenfone 2?

  4. Avatar for House and Lot Cavite House and Lot Cavite says:

    Kailan kaya in May labas nung Zenfone 2? Can’t wait!

  5. Avatar for Ian Ian says:

    Sa sim 1 lang ba enabled ang 4G or 3G? Or pede rin ba enable 3G kahit sa sim 2? i need a phone na pede enable 3G either SIM 1 or SIM 2, hindi yung walang choice kundi sa SIM1 lang.

  6. Avatar for Ry Ry says:

    kumusta kaya ang device when it comes to heating. sobra din kaya maginit to? zf5 sobra kung uminit e.

  7. Avatar for jc jc says:

    Sir, how can i update my device, i already downloaded the .zip on the ASUS official website and save it in my internal storage. yet my device can’t detect any update package. PLEASE Help. How did you update yours? Thank You

    • Avatar for jaymd jaymd says:

      I downloaded the OTA update through the phone itself. Go to Settings > Software Update > Check for Updates

  8. Avatar for jc jc says:

    how can i update my device, i already downloaded the .zip on the ASUS official website and save it in my internal storage. yet my device can’t detect any update package. PLEASE Help. How did you update yours? Thank You

  9. Avatar for keouh keouh says:

    Sir is widget city a good place to buy smartphones? pls reply.big thanks!

    • Avatar for jaymd jaymd says:

      I got mine from them a few days ago.
      The process was quick, just make sure to use a credit card so it’ll be faster.

  10. Avatar for cbv cbv says:

    ung nakalagay sa website ng asus ph dba 2 variants for the ze551ml, one with 2gb ram and the other with 4gb ram. Sana maging available talaga ung 2gb ram na 1080p.

  11. Avatar for cbv cbv says:

    ung nakalagay sa website ng asus ph dba 2 variants for the ze551ml, one with 2gb ram and the other with 4gb ram. Sana maging available talaga ung 2gb ram na 1080p. :|

  12. Avatar for Zell Zell says:

    Bakit Non-Removable yung nasa cons pero sinabi above na removable by unscrewing?

  13. Avatar for Kazeo-san Kazeo-san says:

    I’m worried about how would the 1080p version battery would fair considering that it’s carrying an x86 intel chip that would require emulating once an app is using native arm codes(would consume more battery). It’s still a great device I just hoped that they’ve put a larger than 3000mAh considering it’s 10mm thick.

  14. Avatar for Vance Vance says:

    Although its a good thing to see a review for this unit, you mentioned that Asus will not be releasing this in the Philippines becuase of the similarity with ZE551ML

  15. Avatar for Izar Izar says:

    Do capacitive buttons light up unlike the ones in the predecessors?

  16. Avatar for Ami Ami says:

    saan mabibili yung mga choppers made from scrap?

  17. Avatar for Michael Michael says:

    ganda ng pictures quality nya parang maganda pa sa HTC One M9 eh. tsaka yung scores sa antutu 40K+ parang SD 801 o 805 eh ganyan din.. tanong lang yung Overheating Issues kasi mga 10-15 mins yung zenfone 5 ko umiinit talaga eh pero d naman lag.

    • Avatar for TEKKU TEKKU says:

      Akala ko ang unit ko lang ang may problema pareho pala tayo.Kahit casual gaming lang ay umiinit na umaabot hangang 47 degrees kapag heavy gaming parang pwede ka ng mag luto ng itlog…lol


  18. Avatar for paul paul says:

    in the review you wrote that the 720p screen is still good for 5.5 inch screen but withe difference to large 1080p screen reso of its bigger brother ? anyways great review ! loved this site.

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