You can also read this tutorial in my blog here: https://www.journeybytes.com/2018/01/how-to-check-compatible-4g-lte-bands-in-mtk-phones.html
This video shows you how to check the 4G/LTE bands supported by your Mediatek (MTK) powered Android Device without installing any app.
In addition to the 4G bands, you also get to view the 2G (GSM) and 3G (WCDMA) bands that your phone supports. To do this we utilize the Engineer Mode (Service Mode) that comes installed by default in most phones.
To launch engineer mode we use a secret code (i.e *#*#3646633#*#*) dialled on the stock/default phone dialler and which should work on most Mediatek devices.
The code may however not work with all devices in which case you can try searching online for your device specific code. You can also try using some apps available in the Play Store that can launch Engineer Mode for you.
Checking for bands that your phone can work with confirms to you whether a phone will work with a carrier’s (network operator) 4G network.
You cannot however enable incompatible bands so to avoid being locked out from a 4G network, ensure you check for the bands a phone will work with during purchase. This info can be found on the device’s specifications or can be searched online.
To find out more regarding this and how to tell if a phone will work with a given carrier read here: https://www.kenyanfix.com/2018/08/4g-lte-networks-in-kenya.html (the post is for Kenyan 4G networks, but the theory applies for all 4G networks worldwide).
I’ve also addressed difference between TDD-LTE and FDD-LTE in that post.
To check bands for SPD (Spreadtrum) devices using a similar method as this check my other video here: https://youtu.be/B3crFCodZVY
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Cheers and thanks for watching.