One of the biggest attractions of buying from China is the economic savings that this entails. We no longer only talk about the Global version of Xiaomi or Redmi mobile devices, but about those that, being Global-ROM or chinese version offer a higher discount.

Even so, the fact of buying a Xiaomi or Redmi Global ROM or in Chinese version, supposes having to forget about the B20 band that provides us with the 4G connection in certain regions. A hardware limitation that in many cases is indifferent, but in others, crucial to be able to obtain 4G coverage.

What is the B20 band and how does it affect our Xiaomi or Redmi mobile

The band B20 is located in the 800MHz and is currently still used by the main telephone operators in Spain at the time of offer 4G connection. And it is that, although there are other higher frequency bands, this one offers us certain quite important peculiarities that we should take into account.

Without going any further, as it is one of the lower frequency bands, its waves manage to penetrate more easily in places where the rest do not. We are no longer just talking about rural areas, but inside homes, elevators, garages, etc. where there is a greater concentration of walls.

In summary, although the B20 band is not essential as a general rule, it is true that in rural areas it is the only one that allows us to obtain a 4G connection. Also, even if we live in a city, if our home has numerous walls and obstacles, the B20 band will offer us better coverage.

How to know if my mobile uses the B20 band

if we want check if our company offers us 4G coverage through the B20 band in order to give coverage to our mobile, NetMonitor It offers us in the form of an application a simple and fast method for its verification. For this we will have to take into account which bands are the most used in Spain:

  • 5G bands: n78 (3500)
  • 4G bands: B1 (2100), B3 (1800), B7 (2600), B8 (900), B20 (800)
  • 3G bands: B1 (2100), B8 (900)
  • 2G bands: B3 (1800), B8 (900)
  • * For other countries we recommend you check which bands your operator uses through the tool Kimovil Frequency Checker.

Then we just have to download Net Monitor from Google Play itself and proceed to its installation. Although it is an application that shows us numerous information, we will only look at two important sections.

As we can see, Net Monitor shows us two fundamental areas. The first one at the top where we are shown the currently used band (B1) and a lower area where we can see the rest of the bands to which our terminal could connect (B1 and B8).

NetMonitor Cell Signal Logging

In this particular case I can say that where I am today my Xiaomi smartphone does not usethe B20 band, something totally different from the second screenshot where we can see how the main frequency used is the B20 through 800MHz and also, the one that arrives with the greatest intensity.


NetMonitor Cell Signal Logging

In summary, Net Monitor allows us check what frequency our terminal uses in the place where we are. In this way, we can consult it not only in our home, but also in our place of study, work, etc.

With this we will be able to know if in general, in our day to day, we make use of the B20 band and therefore whether or not it will affect the fact of buying on sale, for example the Redmi Note 9S in Global ROM version or Chinese version.