[Device Reviews and Information] Alberto96:
Review (part 1)

Introduction

This is the OUKITEL K4000 Plus.

Hardware

As a successor of the OUKITEL K4000 Pro, the K4000 Plus brings some nice improvements, with an overall better build quality and a new OS (based on Android of course) called OUKITEL OS. As regards the specs, there are no major improvements. It is powered by a Mediatek MT6737, with 2GB RAM, 16GB ROM and 8MP Back Camera. Maybe an extra GB for the RAM would have been appreciated.

Unboxing

Packaging comes with the standard kit of accessories provided by OUKITEL: 1x Micro-USB Cable, 1x 5V/1.5A USB Charger, 1x Quick Start Guide, 1x Warranty Certificate, 1x TPU Cover and the Smartphone (of course). A screen protector is already applied.

Talking about the dimensions, this is where the upgrade is noticeable. It is 14.43x7.15x1.07cm, not that bad considering the battery capacity, and weights 219g, still a bit too much.

Following all latest OUKITEL devices, also this one features a Metal Chassis, but with a removable plastic back cover. It feels solid, but the back cover makes it slippery.

On the front side there is the standard 2.5D Curved Display and the upper front side of the device features a Front-Facing Camera, an Earpiece, and the Sensors hole that includes Light, Proximity and Gesture Sensors. Luckily, a Notification LED is here.

Here you can see the Notification LED in action.

On the lower front side there is just the Fingerprint Scanner in the center, with no touch keys on the sides. I can't understand this choice, it is a waste of space.

On the back side there is the removable back cover.

The upper rear side of the device features the rounded Camera Sensor supported by a single Flashlight.

On the lower rear side there are some logos together with the Speaker hole.

Device

Screen

Sincerely i'm impressed by the screen of this device, even though the color temperature is a bit too high just like on all OUKITEL devices, it is super-bright, sharp and seems to have an higher than average refresh rate.

The Light Sensor supports almost smooth light changes, with a proper auto-brightness management. This is its maximum brightness.

Viewing Angles matches IPS screen capabilities, nothing to complain about.

Camera

Unfortunately not everything can be great, and the camera department is something that definitely has not impressed me at all. The rear camera isn't able to keep the noise level low, even outdoors, and, as a result, the image detail isn't that great.

"HDR off" on the left and "HDR on" on the right. HDR works just fine, but the noise level ruins it.

Some extra photos taken outdoors. Look great only if you don't zoom them.

The Single-LED flashlight is barely sufficient to provide enough light for low-light shots.

As regards Video Recording, 720p videos are decent, with stable 25fps.

The front camera is a standard OmniVision 2MP sensor, and it isn't a wide-angle variant.

Audio

Speaker Quality confuses me, it is super loud, probably one of the loudest i have ever tried on a smartphone, but at maximum volume it distorts soo bad that it seems to be near to die. Dear OUKITEL, please reduce the maximum volume to avoid any possible hardware damage.

As regards the Microphone, it is decent but a bit too quiet, this is where the volume gain needs to be increased a bit.

GPS

GPS Signal is good, not the best, but at least it is able to lock satellites indoors.

Indoors on the left, outdoors on the right.

Telephony, Mobile Network & WiFi

OUKITEL provides full european bands support, with 4G Band 20 (some other Chinese Smartphones don’t have it). My 4G connection was working just fine, but i think the signal indicator isn't accurate, because i never managed to obtain such high speed with such a low 4G signal.

WiFi 5GHz isn't supported. Connected at 65mbps with my 2.4GHz Network, i was able to reach ~37mbps, not the best, neither the worst.

Battery Life

As always, i measure the real battery capacity using my USB Tester, and it seems that the real battery capacity almost matches the declared value (declared 4100mAh, real ~4070mAh).

Unfortunately the PCMark Battery Test crashes after a long while, so i had to switch to Antutu Tester. Not the best battery benchmark, but it is the most hard to handle benchmark with extreme battery usage, maximum brightness, and everything on. Pretty good result.

As regards battery charging times, the 5V/1.5A charger isn't fast at all, requiring more than 4 hours to full charge the device.

Software

Unlike most devices from OUKITEL, this is the first one released with OUKITEL OS! Even though i don't like custom UIs, this one doesn't seem to be too bad. Based on my research, this based on 360 OS (well-known chinese company), with a mixture of features from iOS and other UIs. The result isn't disappoting, at least for me, and the UI feels extremely smooth, even on high-load. Definitely well-optimized, unlike Dido OS or any other unknown bad UIs that i have seen in the past. Unfortunately, it is running Android 6.0 Marshmallow under the hood, but Android Security Patches are up-to-date.

All kinds of Mediatek features are still here, with MiraVision, Gestures and so on...

One Malware found using MalwareBytes Anti-Malware, but i guess this is a false positive.

The Fingerprint Scanner is blazing fast, almost instant, without any accuracy issue. I'm sorry for the video without any music and intro, but the YouTube Video Editor is out of service. If it won't be back, i will switch to a proper video editor.

[YOUTUBE]w6EsoJWmMi8[/YOUTUBE]​