[Device Reviews and Information] Alberto96:
Introduction

This is the GRETEL GT6000.

Hardware

Joining the battery-phone area, this GT6000 from GRETEL isn't easy to notice between all the others already available, mostly because there isn't any specific feature that makes it different from others. It is powered by a Mediatek MT6737 (unfortunately not the T variant), with 2GB of RAM and 16GB of ROM, and a 5.5" HD screen produced by SHARP. Of course, as the name suggests, it is powered by a 6000mAh battery.

Unboxing

Packaging comes with some accessories: 1x Micro-USB Cable, 1x 5/7/9/12V USB Pump Express Charger, 1x User Guide, 1x TPU Cover, 1x Plastic Screen Protector, and the Smartphone (of course). A screen protector is already applied, and, unfortunately, it doesn't include an OTG Cable (for power-sharing).

The chassis feels really solid, much better than the GRETEL A9 tested before, with a decent design (not unique, but neither annoying) and an overall clean look.

It is 15.45x7.70x1.12cm, a pretty standard size for a 5.5" inches battery phone, with a weight of 235g, not so light, joining the bulky but long lasting battery phones family.

On the front side there is the standard (well nowadays almost all devices have it) 2.5D Curved Display and the upper front side of the device features a Front-Facing Camera supported by a Single-LED Flashlight, an Earpiece, and the Sensors hole that includes Light, Proximity and Gesture Sensors. No Notification LED is here.

As regards the lower front side, there is the fingerprint scanner (that can't be pressed, works as a soft-touch button) with the menu and back buttons on its sides.

On the back side there is the unibody metal chassis with the usual plastic bands on the top and the button.

The upper rear side of the device features the Dual Camera Sensor supported by a Dual-LED - Single-Tone Flashlight, with an unknown black thing on the left side of the camera. (Laser Autofocus?)

On the lower rear side, excluding the usual GRETEL logo with other certifications, there isn't anything at all because the Speaker is positioned on the lower side of the device.

Device

Screen

As regards the screen quality, it is as good as all SHARP IPS panels. Pretty warm colors, accurate color reproduction, and overall good sharpness. It is still HD-only, and with its size of 5.5 inches the pixel density isn't superb.

Its light sensor supports smooth light changes with a maximum brightness of ~400lux. Probably the brightest SHARP panel i have ever seen.

Viewing Angles are as good as you would expect from a good IPS screen.

Camera

GRETEL choose to include a Panasonic MN34152 for the back camera, together with an unknown secondary camera sensor used for the Bokeh effect. The camera is really good actually, i have been always impressed by the performance of this camera sensor, and also on this device, it does not disappoint.

The software seems to increase the noise reduction a bit too much even in bright conditions, but i think this can be easily improved with an OTA Update.

HDR seems to work great, probably better than most devices with the same camera sensor. Photos taken without HDR do not look that bad either.

The flashlight is really powerful as expected from a Dual-LED config., probably also too much as you can notice.

When it comes to the Dual Camera usage...well...i am not an photographer or any expert in this area. Here you can see some shots using the BOKEH option. It seems like a software effect to be honest.

As regards Video Recording, the camera shots videos at 720p30 with a pretty stable frame-rate. This is the maximum supported by the MT6737 SOC.

Unlike some devices, this device features a really powerful flashlight for the front camera too. It makes the difference when it comes to low-light shots, or selfies. It is still a 5MP GalaxyCore Camera Sensor though, so do not expect superb quality.

Audio

The Speaker Quality is good, still with a lack of low-frequencies, but the overall balance between volume and clarity is sufficient. Not the best, neither the worst.

As regards the Microphone, it works decently well in any case (in-call, VOIP, etc...), and the earpiece is loud enough (not too much though) to be used in any condition.

GPS

GPS Quality is decent, able to lock satellites even indoors even if the number of locked satellites isn't really high.

Indoors on the left, outdoors on the right.

Telephony, Mobile Network & WiFi

Providing full european bands support (with 4G Band 20), the device was able to keep a stable connection to my 4G Network, with decent speeds (considering other devices tested in the same place) and mid-high signal.

WiFi 5GHz is supported (rare on MT6737). Connected at 81Mbps, i was able to reach almost ~45Mbps. I guess this is the maximum for the poor built-in SOC, it is still better than using a 2.4GHz network.

Battery Life

Luckily, PCMark run just fine also on this device even though it is running Android Nougat. Other Mediatek Devices with older releases of Nougat (and also some with Marshmallow) caused the Benchmark to stop by itself after some hours. The result is decent, 16 hours, 100% to 20%, it definitely lasts a lot even on high-usage.

As regards battery charging times, the device comes with a Mediatek Pump Express Charger that goes up to 12V (but only 9V is used, SOC limit). The result is an ultra-fast charging process, but even without it, using a 5V/2.4A charger, it isn't too slow to charge.

Software

Thankfully GRETEL doesn't include any Custom OS on any device, and this one runs on Android 7.0 Nougat with almost-up-to-date (April 2017) security patches. There isn't any bloatware preinstalled, and the device feels pretty smooth while running basic tasks.

Even though most Mediatek Features are there (such as Gestures), MiraVision is missing. Considering the pretty warm color temperature of the screen panel, i guess this is something GRETEL should enable with the next OTA Update.

Unfortunately there is no Gyroscope or Magnetometer/Compass, but it was expected considering the price target of this device.

No malwares detected with Malware-Bytes Anti-Malware using latest definitions.

As regards the Fingerprint Scanner management, it works pretty well with fast unlock times and no accuracy issues.

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