When I think about ASUS, the first thing that comes to mind are their PC components like motherboards, GPUs and the like. I also think of their desktop and laptop computers. Part of that is probably due to my longstanding interest in PCs and PC gaming, but even so, the idea of ASUS as a smartphone company is one that I don't think about that often. However, ASUS has been offering smartphones since the days of Windows Mobile, and they've been a very important player in the Android tablet space with their transformer tablets and both generations of the Nexus 7. With smartphone + tablet hybrids like the ASUS PadFone, it was seemingly inevitable that ASUS would become a competitor in the world of discrete Android smartphones.

While ASUS has been making progress in the Asia-Pacific region, they haven't made as much progress in North American markets as I suspect they had hoped to. That brings us to today with the ZenFone 2. After initially going on sale in ASUS's home country of Taiwan on March 8th, and more recently in Japan and India, the ZenFone 2 has now made its way to the shores of countries around the globe. As a phone that marks a new generation of ZenFone devices from ASUS, the ZenFone 2 represents another chance for ASUS to break into the markets of Western Europe and North America.

Although the ZenFone 2 is a second generation ZenFone, the device it most directly succeeds is the ZenFone 5. The naming may seem strange, but it's due to ASUS moving away from their original naming scheme where the number represented the size of the display. That type of naming doesn't scale well when you need to refresh your devices every year, and so the 2 in ZenFone 2 designates it as a second generation ZenFone.

Although the ZenFone 2 starts at just $199, you shouldn't be deceived by the price. The ZenFone 2 has some extremely impressive specifications for a low-cost smartphone, launching with a fairly powerful Intel quad-core Atom SoC, 2GB+ of RAM, and a 5.5" 1080p IPS screen. We'll be taking a look at each of its components in depth over the course of the review, but you can take a look at an overview of the ZenFone 2's specs below.

  ASUS ZenFone 2 (Base) ASUS ZenFone 2 (High-End)
SoC Intel Atom Moorefield Z3560
4x Silvermont @ 1.8GHz
Intel Atom Moorefield Z3580
4x Silvermont @ 2.33GHz
GPU PowerVR G6430 @ 533MHz
NAND 16GB + microSDXC 64GB + microSDXC
Display 5.5" 1920x1080 IPS LCD
Dimensions 77.2 x 152.5 x 10.9 mm, 170g
Camera 13MP Rear Facing with F/2.0 aperture
5MP Front Facing with F/2.0 aperture
Battery 3000mAh (11.4Wh)
OS Android 5.0 Lollipop with ASUS Zen UI
Cellular Connectivity 2G / 3G / 4G LTE (Intel XMM7262 Category 6 LTE)
Second SIM 2G GSM (Intel XMM2230)
Other Connectivity 802.11a/b/g/n/ac + BT 4.0, GNSS, NFC, microUSB2.0
SIM Dual MicroSIM slots
Price $199 $299

Due to the large variations in the frequencies and technologies used in networks worldwide, ASUS has five different SKUs of the ZenFone 2. Four of the models are for FDD-LTE networks, while the fifth is for TDD-LTE in China and India.

Although it's not listed on their global website, the North American version of the ZenFone 2 has support for the AWS band on UMTS networks. ASUS was unaware of this when I contacted them about it. However, I have been able to use the phone on WIND mobile, which is a Canadian carrier that only operates their HSPA network on the AWS band. ASUS has also updated their Canadian and US websites to reflect the support for AWS since the time that I contacted them about it.


In recent history, ASUS has adopted a form of industrial design that I consider to be very unique and recognizable. Many of their products are made out of machined aluminum, with a brushed finish that reflects light in a unique manner. This design extends to their products made of other materials like plastic, where the design often imitates the appearance and color of their aluminum devices. This type of design ties in well with the Zen branding across all of ASUS's product lines, as it's inspired by the lines and circles in the sand of Rock Gardens that were created by Zen Buddhists in fourteenth century Japan.

Owing to its removable back cover and very affordable design relative to its specs, the ZenFone 2 is primarily made of plastic. However, it does a very good job of looking like a device made of aluminum. It's difficult to expose in photos, but the back cover reflects light in a very similar manner to my ASUS Zenbook which is actually made of aluminum. The color on the grey model is also spot on as well, and using plastic allows ASUS to offer a variety of different colors and patterns. I personally would have preferred an aluminum build, but that's far too much to ask for when you consider everything else that ASUS is packing into a $199 device.

Although the back cover of the ZenFone 2 is removable, it actually has a very solid attachment to the phone. When removing it to access the MicroSD and two MicroSIM slots I was actually worried I might break one of the plastic tabs that holds it on. Since the battery isn't removable, I don't think users will be removing the back cover very often.

ZenFone 2 After One Unscheduled Drop

Unfortunately, while I think the plastic on the ZenFone 2 looks good, I can't speak very highly about its durability. When photographing the ZenFone 2, I accidentally dropped it from about half a foot high onto a concrete step. I'm usually very careful with my devices, but I lost my grip while trying to hold both my camera and the phone. Since it was such a small drop, I expected that the ZenFone 2 would be unscathed. As you can see above, I was mistaken. That small fall onto concrete heavily damaged the bottom edge of the back cover, and put some serious scuffs and scratches near the speaker holes. While it was completely my fault for dropping the phone, the lack of durability is pretty shocking. I would definitely recommend investing in a case, and all I can do is hope that ASUS starts selling the different back covers separately.

A consequence of the back cover also covering the sides of the device is that the power button on the phone actually comes off when you remove it. This is similar to the 2015 Moto E which has a removable outer frame with the plastic button caps attached to it. Unfortunately, the power button on the ZenFone 2 has absolutely no tactile response, and barely even feels like it's being pushed down. It's also located on the top of the phone, which makes it very difficult to press when trying to turn the phone on and off. Thankfully, ASUS supports double tapping on the display to wake up the phone, which eliminates around 50% of the times you would normally have to use the button.

Update: Some users have let me know in the comments that ASUS also supports double tapping to shut the screen off. This can definitely be helpful, but since you need to tap on a blank area you'll usually need to double tap on the status bar which can still be difficult to reach on such a large device. A side mounted power button definitely would have been most optimal, but the double tap to wake and shut off definitely mitigates the issue of having it on the top.

While the power button placement on the ZenFone 2 is questionable, I think ASUS has made a good call with their volume button placement. Much like the LG has been doing on their similarly sized devices, the ZenFone 2 places its volume rocker beneath the camera on the back of the phone. I have not heavily used any of LG's phones, and I was surprised at how quickly I adapted to having the volume buttons on the back. It's much more ergonomic than placing them on the left side on such a larger device, and it avoids the potential awkwardness of placing them on the right side. The volume rocker also has a circular spun finish much like ASUS's laptops, and I appreciate those types of very small details that ASUS could have easily left out but chose not to.

Overall I'm quite happy with the aesthetics and the feel of the ZenFone 2. Without holding it you could definitely be fooled into thinking it's made of aluminum, and when you do pick it up it still feels pretty good in the hand. I would be lying if I said I wasn't bitter about how easily the back got damaged though, and unless you're sure you'll never drop it I suggest getting a case or some other form of protection.

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  • loimlo - Saturday, May 30, 2015 - link

    My mom has been using 1st gen, Zenfone 5 for 10 months. ASUS SW update literally broke app compatibility several times during this period. At some time, my mom couldn't disconnect a phone call due to a nasty SW bug! I'd to lock the screen and unlock it again to disconnect. It's not the end of world, but still an alarming for potential 2nd gen, Zenfone 2 buyers. Fantastic HW value, but subpar SW update quality.
  • ketacdx - Thursday, May 28, 2015 - link

    I've been using the TW model since long before the NA launch and there have been a lot of software Updates and ZenUI updates but its not like a beta testing thing. They are fixing issues most manufacturers don't bother with. Little things that they are truly optimizing that a normal person would never notice. Aside from my worry about the quality of the gorilla glass when dropped (think nexus 4 outcomes), the QC elsewhere on this things feels prime. I have no concerns.
  • Dawgmatix - Wednesday, May 27, 2015 - link

    Are there any phones with arm processors that use the same display? What does their battery life look like? How can we be sure its not the cpu or gpu that is eating up the battery?
  • Brandon Chester - Wednesday, May 27, 2015 - link

    Because the SoC power usage is small relative to display power usage on any device during the browser test, and the ZenFone 2 performs worst of all in that test. In tests where the SoC has a greater impact and the display has a lesser one it actually achieves a battery life closer to that of other devices.
  • YOUCANNOTDENY - Wednesday, May 27, 2015 - link


    I had a few observations/questions. I currently own the $199 version of the Zenfone 2, and have not noticed any dynamic contrast or CABC during my time with the device. This may be because I cannot recognize it, but I'm pretty sure something similar is used in my Dell XPS 13 Ultrabook with Intel's HD Graphics drivers (I promptly disabled the dynamic contrast shifts in Graphics Settings). I have, however, turned off "Smart Saving" in Power Management on the Zenfone 2, so that may be what is causing the difference. I am also on the latest software version, which may have introduced changes.

    One other thing, I noticed that in the "Splendid" app, owners can change the color temperature of the screen. I immediately noticed the overly cold white point of the screen when I first powered on the device, so I looked to the Splendid app to change the color temperature. I am currently on "Reading Mode" with default settings on the slider, which makes the screen more bearable to my eyes, but I am still unsure of the absolute color accuracy. If at all convenient, would it be possible to rerun screen accuracy measurements in the various color temperature modes offered in the included "Splendid" application? Perhaps, we may be able to find a setting that makes the most of the included panel and does it justice.

    Thank you!
  • Brandon Chester - Wednesday, May 27, 2015 - link

    The CABC is there on both models. I made sure that ASUS's power saving features were disabled before I did my testing.

    While I could try and adjust vaguely labelled sliders in the Splendid app to fix the display's white point, the gamma and greyscale are not possible to fix because of the CABC. Because of this, there's no point in trying to fix the display.
  • Quad5Ny - Wednesday, May 27, 2015 - link

    @Brandon Chester ASUS stock theme looks like a copy of Solstice by John Bussell (@myeverydayghost) who based his theme on Apple's iOS 7. -- http://modmyi.com/info/solstice.php, http://cydia.saurik.com/package/com.modmyi.solstic...
  • UtilityMax - Wednesday, May 27, 2015 - link

    The device is not without flaws, but the $200 model seems like a good value. However, the $200 model is a bit dubious proposition considering how close it is to the OnePlus One.
  • Sammaul - Thursday, May 28, 2015 - link

    Have the $300 model, and have used a OnePlus...frankly in real world usage it's kind of a wash. OnePlus has better battery life, camera, and speakers. The Zenfone is absolutely quicker and smoother, even with none of the bloat uninstalled. That 2 channel ram in it does wonders compared to other phones I have used.
  • MoJo JoJo - Wednesday, May 27, 2015 - link

    I have been using ZenFone 5 for almost 7-8 months. There's only one thing that I don't like about ASUS is that software and software updates.

    ASUS ZenUI is buggy as hell. They provide some update to improve one area and ruins the other. They just cannot provide a single, practically stable, update/ROM. It irritates me a lot. Even now most of the ZenFone 2 users are facing so many issues of Shitty Battery" "Force Stop" "Worse Camera" "Heating under normal use (45 deg.C)

    Software Update:
    Like I said I have been using ZenFone 5 for 7 months, it seems like ASUS is very slow in updating their devices. First, ASUS launched the 1st gen. ZenFone series in July 2014 (in my country) with Jelly Bean 4.3 instead of KitKat 4.4
    After almost 2 months of waiting (Aug-September) they released the KitKat update. That update messed up everything, literally everything. It took another 1-2 updates for ASUS to remove the bugs.
    In November 2014 they announced that whole ZenFone series will get the Lollipop update in April 2014. It's almost the starting of June but no ZenFone (intel Version) has got lollipop yet! They are just delaying the update to sort out the bugs. But no use. In May Google has rejected their update during verification. So, still waiting for update, which will be 5.0 not even 5.0.2 (Though they have promissed to give 5.1 update, but it will take ages to come).

    Moral of the Story:
    No doubt, ASUS is great in providing high end specifications. But it ends there itself. The whole experience gets ruined by the software.

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