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Xiaomi Redmi 4X will finally replace Redmi 3S, which is not produced anymore. The extremely popular Redmi 4 Pro/Prime, the Redmi 3S successor, will be preserved. Apparently, Xiaomi wants to use the Redmi 4X as a springboard to the international Band 20 version. At first glance, Redmi 4X is a Redmi 3S in freaking cool pale colours. The further equipment, consisting in an Octa-core Snapdragon 435, a HD display, a 13MP camera with f/2.0 aperture and a 4100mAh battery, can convince. Furthermore, you can choose between 2/16GB and 3/32GB of storage. This makes Redmi 4X the only alternative to Redmi 4 Prime with 3GB of RAM.

Overview of Redmi devices

Redmi 4X is a further member of the Xiaomi low-budget family. You can find all the differences in the following table:

Redmi 4 Prime

Redmi 4X

Redmi 4

Redmi 4A

Processor Snapdragon 625 Snapdragon 435 Snapdragon 430 Snapdragon 425
Storage 3GB RAM, 32GB 2/3GB RAM, 16/32GB 2GB RAM, 16GB 2GB RAM, 16/32GB
Camera 13 MP, f/2.2, PDAF, Dual-Tone LED 13 MP, f/2.0 PDAF, Single-LED 13 MP, f/2.2, PDAF, Dual-Tone LED 13 MP, f/2.2, Single-LED
Display 5 Zoll, 1920*1080 5 Zoll, 1280*720 5 Zoll, 1280*720 5 Zoll, 1280*720
Battery 4100mAh 4100mAh 4100mAh 3120mAh
Price 135€ 95€/125€ 110€  80€

Design and build quality

Lenovo’s K6 looks like a Redmi 3S, and now Xiaomi dyes their old top seller pale black, pink, and gold. Our testing device was black, and it looked like a silver car painted over with pale black. It looks freaking awesome.

Xiaomi Redmi 4X Farben mattschwarzThe dimensions of 139x70x8.65mm are nearly the same as Redmi 3S’s dimensions. However, Redmi 4X is 6g heavier (150g), but you barely notice it. The metal body enclosed the phone at the sides, but only at the middle part. At the smartphone’s top and bottom you find plastic tops, which reduce neither the high quality impression nor the nice appearance. 2.5D glass secures a perfect transition to the aluminium rear side and confirms the premium feeling.

Redmi 4X has the three common Android sensor keys below the display, which are not illuminated in this case. Below the home button, there is a notification LED shining and pulsating in a bright white colour. The mono speaker is now located at the bottom instead of the rear. It is pleasantly loud and does not oversteer even at highest volume. As usual for smartphones, heights are dominant and the basses are rudimentary perceivable. Considering that Redmi 4X is a low-budget device, the sound quality is excellent. The fingerprint scanner on the rear convinces with high accuracy and unlocks the phone from stand-by within a second.

Redmi 4X has a classic micro-USB port, and the rear camera is protected from direct contact with surfaces by a metal ring. Audio jack, infrared sensor and an additional microphone can be found at the smartphone’s top. Power button and volume control are made of plastic and fit perfectly in the frame. You can insert either a Nano and a micro-SIM or a Nano and a micro-SD card (up to 128GB) in the SIM tray.

Xiaomi Redmi 4X provides perfect build quality and you cannot find any gaps or sharp edges. Design and haptics are fully convincing.


The 5-inch IPS display shines with 450cd/m² and has a resolution of 1280*720pixels. With a pixel density of 294ppi it is hard to detect any single pixels. In a direct comparison to Redmi 4 Prime (441ppi) I could tell no difference between the two displays in terms of sharpness. You can choose between warm, normal and cold colour representation in the options menu. You also have two possibilities with the saturation. Further, there is a very good reading mode available as well as automatic regulation of the display brightness, which regulates the brightness according to light conditions within a second.


As typical for IPS, viewing angles are extremely stable and brightness is sufficient in direct sunlight as well. However, depending on the position of the sun, you cannot prevent the display from mirroring strongly. Colour representation is accurate and not too strong in the standard mode, as it is the case with Redmi 4 Prime’s display. Contrast is great for an IPS display. Redmi 4X’s touchscreen registers 10 points of contact at the same time and provides an accuracy on a high-end level. The surface makes it easy for your finger to glide and it is scratch resistant. However, you have to wipe the display clean from fingerprints and greasy marks from time to time. Those who prefer a sharper display (on the data sheet) and strong colours should choose Redmi 4 Prime. Those preferring an accurate colour representation and real white instead get an excellent display with Redmi 4X.


Xiaomi Redmi 4X houses a 64-bit Qualcomm Snapdragon 435 processor. The 8 ARM Cortex A53 cores of the processor clock at maximum 1.4GHz and are supported by a Mali-505 GPU, which clocks at 450MHz. If you expect a significant difference to the Snapdragon 430 of Redmi 4 or Redmi 3S, you will remain disappointed. The only difference lies in the supported LTE category (maximum download and upload speed). The 435 processor now has an X9 LTE modem and allows a hypothetical download and upload speed of 300/150MB/s. In comparison, the X6 modem of the Snapdragon 430 has a speed of “only” 150/75MB/s. Correspondingly, the benchmark results are comparable to any other Snapdragon 430 device (Lenovo K6, Redmi 3S).

Xiaomi Redmi 4X was designed for surfing, watching videos, chatting and using apps; tasks, which it carries out reliably and fast. Even demanding 3D games (e.g. Nova 3, Asphalt 8, Modern Combat 5) are playable, but of course, Redmi 4X is not a gamer smartphone. Although the phone has a weaker GPU, the gaming performance is on the same level as Redmi 4 Prime because 4X has a lower display resolution. The internal storage has a reading/writing speed of 160/146MB/s, which is above average. The RAM has a speed of 4.7GB/s, which could be a bit faster. In comparison, Redmi 4 Prime has a RAM speed of 7GB/s. Even after one hour of gaming Redmi 4X did not get too hot, as the casing gets only slightly warm. System performance in the MIUI V8 system is excellent and will be sufficient for most users. In order to get a significant boost in terms of performance, you have to pay a lot more for a Snapdragon 820 and an UFS 2.0 memory chip, even on

Operating System

Xiaomi Redmi 4X houses a MIUI V8.3 system based on Android 6. MIUI is one of the most popular custom ROMs on this planet. The system has no app drawer (overview of all apps), but it has an excellent home screen management system. Apps can be organised fast without app drawer as well. The integrated theme app makes it possible for users to customize MIUI’s design to the smallest detail. In addition, you can change the notification and internet access for each app individually. MIUI offers a great deal of useful functions, of which you’ll discover more and more after some time.

You can also clone apps or install a completely independent second space. Xiaomi’s operating system is doubtlessly one of the fastest, most beautiful and most intuitive Android systems on the market. Until one year ago, you had to install Playstore and Google Services yourself and the ROMs were meant to be only for the Chinese market. Now, almost every Xiaomi device gets an official international GLOBAL ROM. It contains regular updates (although not as quickly and frequently as the China ROM or Developer ROM) and the Playstore is preinstalled. As an alternative, you can also use the Xiaomi.EU ROM, but in this case you have to install updates manually.

A big strong point is Xiaomi’s update policy, which the manufacturer pursues since several years. It often takes a bit more time to change the Android base to Android 7 Nougat (compared to other manufacturers); nevertheless, the system on all devices is provided with new functions and bug fixes. Xiaomi Redmi 4X Global is delivered with the official Global ROM ex works.


The 13MP camera is different from Redmi 4 Prime’s camera because it now has an f/2.0 aperture. In practice, however, the difference is barely noticeable in good lighting conditions. Redmi 4X has a great image quality. Pictures are taken fast, sharp, rich in detail and image noise is limited. White balance is accurate and because of the vivid colour representation, pictures are nicer than those made with a Redmi 4 Prime. The images are sharper as well.

The Redmi 4X’s selfie camera is convincing as well. The front camera takes detailed and sharp pictures. Here, too, Xiaomi Redmi 4X is better the Redmi 4 Prime, although the difference is minimal. You can record videos with 30FPS and full-HD resolution. The recordings are nothing special and mostly blurred because of missing image stabilization. Considering the price, image quality is good, but the sound is not the best one.

Those searching for good cameras up to a price of 150$ cannot go wrong with Redmi 4X. However, we have to mention that the bigger brother, Redmi Note 4X, takes significantly better pictures at a price of also 150$.

Communication and connectivity

Reception in 3G and 4G networks is excellent. If 4G is not available, you can also use the fast UMTS network. The Wi-Fi module supports the n-standard, but it only supports the 2.4GHz network. Range was well as throughput is great. The Bluetooth 4.2 module does a good job, as does the infrared sensor. The earpiece is loud and the microphone transmits the voice clearly.


GPS reception surprised in a positive way. Xiaomi Redmi 4X could determine the position even inside buildings. It is up to 3-4meters precise outside and the phone with integrated compass is suitable for car navigation as well as for pedestrian navigation. Next to acceleration, proximity and light sensors, there is a gyroscope sensor as well. A FM radio is supported, too.



The Redmi and Redmi Note series by Xiaomi have one thing in common: probably the longest battery life currently available on the market. The big 4100mAh battery does not reduce the haptics in any way. The HD-display should have resulted in another improvement concerning battery life compared to the FHD-display of Redmi 4 Prime and Note 4X. In practice, however, both of the smartphones are on the same level; currently, Redmi Note 4X offers the best battery life. In the PC-Mark battery test, Xiaomi Redmi 4X lasted for 11 hours (medium display brightness). It is nearly impossible to run down the battery in just one day. After 2 or even 3 days the phone often had a DOT (display-on time) of 7-8 hours. Those who do not like charging their phones everyday should buy a Redmi 4X.

Redmi 4X does not explicitly support Quick-charge, but the load time is short. From 10% – 90% you get 10% of the battery capacity every 15 minutes. The Redmi 4X is fully charged in 2 ½ hours. It is not on a Quick-charge 3.0 level, but this is not even necessary in the low-budget section.

* Incl. VAT and, if applicable, delivery costs – subject to interim changes.


87% Awesome

Xiaomi Redmi 4 Prime, with a full-HD display and a stronger Snapdragon 625 processor, was the right upgrade to Redmi 3S, at least on the data sheet. Xiaomi Redmi 4X is merely a Redmi 3S with some smaller improvements. The new, foiled design in black, gold and pink is not only new, but also quite awesome. The 2.5D glass at the front highly increases user friendliness and haptics. Redmi 4X is once again the Holy Grail in the low-budget sector.

Those looking for the biggest bang for the buck will not be able to get around the Redmi series. Many are still waiting for an international version of Redmi 4 Prime. However, Redmi 4X is now available with Band 20. You have to decide for yourselves which Redmi you choose. All 3 devices should be listed one after the other in the list of the best low-budget devices. Redmi 4a is the cheapest and least powerful model with a plastic casing. Compared to Redmi 4 Prime or Redmi 4X, there are significant differences. If you directly compare Redmi 4 Prime and Redmi 4X, the differences are so small that you should base your purchase decision rather on design and the current price. After a detailed comparison, I cannot confirm neither the Redmi 4 Prime’s sharper and better display nor a significantly better performance.

  • DISPLAY 90 %
  • CAMERA 80 %
  • BATTERY 90 %

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