OUKITEL K4000 Plus Review – A Well-Rounded Budget Phone

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If you’re on a budget and you want something with great battery life, the K4000 Plus won’t let you down.

A couple of weeks ago we got to spend some time with one of OUKITEL’s latest devices and one that had a fairly large battery – the K6000 Plus. This past week we got to spend some time with another one of OUKITEL’s smartphones, only the battery isn’t as big and the phone itself is a bit smaller as well. We’re talking about the K4000 Plus, which is a little bit more in the entry-level range of OUKITEL’s offerings, though it still has some nice things going for it. Even though the K4000 Plus and the K6000 Plus are being targeted at different markets, there are some similarities between the two. Both have OUKITEL’s characteristically long battery life and both devices actually pack quite a bit into a device that isn’t going to cost nearly as much as some of the other devices in the same tier that come from more prestigious brands. Let’s take a closer look at what the OUKITEL K4000 Plus has to offer and see how it stacks up.



The K4000 Plus is one of OUKITEL’s more modest devices, and with that comes some more modest specifications. It’s got a 5-inch IPS display with an HD resolution, which may be a bit smaller than some or even most smartphone owners are used to these days, but the size also makes the device more pocketable, and it’s certainly a size more fitting for the screen resolution. It’s powered by a processor from MediaTek specifically the MT6737 which is paired with a Mali-T720 GPU for the graphics processing. There’s 2GB of RAM for the memory and task management, as well as 16GB of internal storage space for the apps, games, and media.

If 16GB isn’t enough the K4000 Plus also supports expandable storage space with the use of a microSD card. When it comes to the battery the K4000 Plus may not have as large of a battery as the K6000 Plus, but it still has a higher capacity than most other smartphones out on the market. It features a 4,100mAh battery which adds a little to the thickness and the overall weight of the phone, but it also keeps the device powered on for quite a while too. For the cameras the K4000 Plus is working with an 8-megapixel rear-facing camera with LED flash and autofocus, and images can be interpolated to 13-megapixels thanks to the camera software. As for the front camera, the phone carries a 2-megapixel sensor here which is a bit on the low-end but this is an entry-level device and costs had to be cut somewhere. It supports Wi-Fi 802.11b/g/n as well as Bluetooth 4.0, and it uses micro USB 2.0 for the charging port. It also has a fingerprint sensor on the front of the device which doubles as a home button.

In The Box

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We’ve spent so much time with OUKITEL’s devices recently it feels like we already know what’s going to come in every single box with all of its different devices. Of course that isn’t the case as each device is a bit different, but OUKITEL does stay true to some things. For instance, aside from the phone which is the first thing you’ll find once you open the box up, you’ll also find a clear silicone case as well as a screen protector, both of which are also already on the phone. Other than that you’ll only find the charging adapter and the charging cable as well as a quick start guide.

Hardware & Design

The build of the K4000 Plus is a mix of premium feeling materials and some that are more mid-grade. It’s using a metal frame complete with chamfered edges but also has a removable plastic back cover that goes over the battery. Mind you this is a non-removable battery, but the back cover still comes off as this is how you access the SIM card slots and the microSD card slot. Overall the design is not bad and instead is just rather unassuming.


As for the hardware, the front of the device shows fairly noticeable bezels on the sides and on the top and bottom. At the bottom you’ll find the fingerprint sensor which also acts as a home button, and up top you’ll find the front-facing camera and ambient light sensor on either side of the earpiece. If you flip the phone to the bottom edge this is where the micro USB charging port is along with the mic for picking up your voice during calls or when using any of the voice recognition features. Up on the top edge there’s a 3.5mm audio port for plugging in headphones, the left side of the phone is completely free of any buttons while the right has both the power and volume up and down buttons. Flipping the phone over there’s the rear-facing camera and LED flash in the top left corner, while the one and only speaker sits in the bottom right corner. The phone has a pretty ok feel to it when holding it in the hand, but the plastic on the back is not textured at all or come with a grippy coating like you’ll find on a lot of devices. This poses a little bit of an issue for the sheer fact that it gives the phone less grip than you might normally find on a device that has a plastic back, and while it’s not as slick feeling in the hand as many phones with a metal back, it still has less grip than we would have expected.


The display on the K4000 Plus might only be 720p HD, but it really isn’t too bad of a display. The resolution is actually just fine for the size, and it gets plenty bright in the direct light outside. Responsiveness is also quite good and I didn’t notice any issues with the screen not recognizing my touch during the times I was interacting with it. Perhaps the only complaint I have is that the screen brightness bar isn’t as easily accessible from the quick settings screen like it is on the Google Pixel and other devices, though this isn’t really something to do with the display and really has more to do with the software as well as the decision to place it at the very bottom of the quick settings, which you need to drag down a second time or tap on the visible down arrow to get to. This only poses an issue for me personally because I’m so used to seeing at the top on the device I use daily.


For the most part it seems that OUKITEL used a pretty good panel and digitizer here with the K4000 Plus, and that’s always nice to see with phones that don’t cost as much. What’s even better is that the screen’s color temperature can be modified a little bit if you aren’t happy with the way that the colors look by default, though the settings for this are a little bit hidden. Under display settings you’ll find the MiraVision option at the top, and if you tap that the screen it takes you to seems to just describe MiraVision, but if you look in the top left corner where the hamburger menu usually is there’s an option there is a slide out menu you can access, and this is where you’ll find options to adjust the color temperature with three different picture modes including standard, vivid, and user mode, the last one giving you the most control over the various aspects of the screen’s color reproduction.


The OUKITEL K4000 Plus didn’t seem to have any problems in the performance department and it actually held up pretty well for most of the tasks we used it for. This was mostly for browsing through Facebook and using it for the occasional email or YouTube video, as well as gaming here and there. The device does only have 2GB of RAM which might have been an issue for some devices and some users depending on how they planned on using the device, but it didn’t really cause any issues on our end.


It seemed to perform just fine when playing games, though it might be worth mentioning that the only game I could install on it was Magikarp Jump, as the first few games I tried to install that were a little more graphics intensive would get about 88 percent to 95 percent of the way through the download and then stop. No matter how many times I tried the install process, even after a phone reboot or two, the results were the same, so perhaps this has something to do with the performance. Perhaps not. Either way for the tasks we actually did execute the K4000 Plus seemed to be ok, so the moderate and average users shouldn’t have any problems.

Fingerprint Sensor

Just like with the OUKITEL K6000 Plus, the K4000 Plus has a decent fingerprint sensor when it comes to speed. It was quick to unlock the device after using it a few times, though it did have a bit of trouble recognizing my thumb print based on the angle of my thumb when touching the sensor. In most cases there were no issues with recognition at all, but just like on the K6000 Plus it just couldn’t seem to recognize my thumb print at a certain angle after setting it up. This might seem like just the placement of my thumb being the issue, but I haven’t had a problem with it on other devices, so I can only assume that the fingerprint sensor being used is just not as responsive. Overall the sensor is great though and you won’t have any issues with speed, and some or even many users may not have issues with recognition at all.



With only one speaker you can’t expect the audio on the K4000 Plus to be of exceptional quality but it wasn’t too bad. OUKITEL uses something that it calls 3D Sound with the single speaker the phone does have which seems to attribute to part of its decent quality, though it also probably doesn’t hurt that its placement helps keep it from being covered up by my hands when using it in landscape mode. Although it is a back-facing speaker, it’s just high enough from the bottom edge and inward enough from the right corner to keep my fingers from resting over it, so the sound doesn’t really get muffled at all during use, and this was a huge plus for me personally.

Speaker placement aside, as for actual sound quality it wasn’t the loudest or most rich sounding speaker we’ve ever heard on a smartphone, but it will do just fine for its price range and for those who are wanting to spend this kind of money on a device, that is not a whole lot, it should suffice. If you’re looking for a phone with dual stereo speakers or just generally a higher quality of audio, then you may want to look elsewhere.


Phone Calls & Network

This is an unlocked GSM device so it may work for 2G and 3G networks in the U.S. but then again that’s also something you’ll want to confirm before considering picking one up. I can tell you that like every other device I have reviewed it doesn’t accept a Project Fi SIM card, and it also supports the same network frequencies as every other OUKITEL smartphone. You can view the supported network frequencies below.

2G: 850/900/1800/1900
3G: 900/2100
4G LTE: 800/900/1800/2100/2600


As to be expected the K4000 Plus scored fairly low on the benchmark tests that we ran it through, which kind of paints a picture of how it’ll perform but you still get a better picture of how it works with real-world use. Like with all of our phone reviews we ran it through AnTuTu, Geekbench 4, and 3DMark for the benchmarks, and you can see the results of those benchmarks below if you like.

Battery Life

With a 4,100mAh battery the K4000 Plus was bound to have decent battery life and it certainly didn’t disappoint in this area. As always this is one area where OUKITEL does exceptionally well in its delivery for device features. 4,100mAh is also a good size larger in the battery capacity department than most other smartphones on the market, even flagships. As for actual battery life it lasted about two days or so before having to recharge it, and I got about 7 hours of screen-on time with it during a test of continuous use. We also ran it through a battery benchmark test and it got just a bit more screen-on time, sitting at about 7 hours and 55 minutes. Based on this, battery life is definitely going to vary from user to user, but it’s also safe to say that no user should be disappointed with the kind of battery life they get with the K4000 Plus as it will outlast most top-end flagships, or at least keep pace with them.


Oddly enough, even though the software experience is different from stock Android and doesn’t have some of the same stuff, like an app drawer, it’s also different from some of OUKITEL’s other phones. For example, the K6000 Plus actually had an app drawer which was a little bit different from the majority of OUKITEL’s devices and there are some features present on the K4000 Plus which look different too. For example, the K4000 Plus has a different looking floating shortcut button. The K6000 Plus has this button too but it doesn’t seem to have the same design to it and there are slightly different quick access shortcuts on it. Many of them seem to be a different way to access the quick settings that you can find in the notification shade, but there is also a way to access a booster option for freeing up RAM as well as a screenshot button, and there is even a button in the middle of the floating button that takes you to an open browser page with a Google Search bar at the top, as well as some shortcuts to web pages with tabs for different categories based on what you’re trying to browse.

There is a slightly different lock screen with this UI and instead of sliding up you actually slide to the right of the screen to unlock it though from here it’s the same and you simply put in your PIN or password. Like on some other OUKITEL devices there is a small arrow next to the navigation buttons at the bottom which lets you hide the nav buttons, and when hidden you can bring the buttons back up by swiping up from the bottom edge. In the settings menu you can find a fair amount of additional software tweaks that are part of OUKITEL’s UI on some of its phones, like gestures for unlocking the display and launching shortcuts or apps, a three point screenshot, and then of course there’s the floating shortcut button that we already mentioned. The UI design also has a unique look to it that is quite a bit different from stock Android, though that pretty much sums up the extent of the software differences that you’ll find with this device as everything else either boils down to an app or they’re features which you can find on just about every Android device these days.


The picture department is definitely one of the most basic areas of the phone as the camera is only an 8-megapixel sensor and the camera UI is pretty bland, as are the features. There isn’t a whole lot of extras when it comes to camera features here, but you will find some things you can tweak to add some life to your shots, such as an HDR button, a Face Beauty mode, and Panorama mode. In addition to that if you tap the settings icon in the bottom corner of the UI there are some other things you can tune just a bit, such as the exposure, white balance, color effects which are basically just filters for your images, and the scene mode which you can change based on what it is you’re taking pictures of.

That’s about it though in terms of the features. As for the actual quality of the images, it is an entry-level phone so users shouldn’t be expecting anything exceptional that will compete with higher-priced phones, but for an 8-megapixel main sensor the images aren’t terrible. They do get a bit grainy or noisy if the lighting isn’t just right or they can be a little too washed out if there is too much light in the scene, though this isn’t too different from most smartphone cameras. Color reproduction of the images is ok, not excellent, but not the worst either. Overall the images are fine for an entry-level phone, though it does take longer than I’d personally like for the camera to actually capture the image. So it’s not the quickest camera in the world and it’s not the most high-quality or feature-packed, but it will do just fine for anyone who isn’t looking to this phone for their main camera.

The Good

Excellent battery life

Ability to adjust the color temperature

Fast fingerprint sensor

Some nifty software features like gestures and the floating shortcut button

Expandable storage

Decent audio

The Bad

Fingerprint sensor had some issues with recognizing my thumb print

Camera was not the best

No USB Type-C

Performance could have been a little bit better

Phone felt slicker in the hand than expected which made a little harder to hold

Wrap Up

When it comes down to it OUKITEL has put out another ok phone with the K4000 Plus, and that’s the key word. Ok. This device won’t be the chart topper that many are used to and that’s just fine as it does some things pretty well and with others it just gets by. It’s a budget device though and that should be expected.

Should you buy the OUKITEL K4000 Plus?

That all depends on what sort of features you want in a smartphone. If you’re on a budget and you just really want something with great battery life, the K4000 Plus definitely won’t let you down. Not in the slightest. If you need something with a better quality camera, then there may be better choices though they will also probably come with a higher price tag.

Buy The OUKITEL K4000 Plus