I don't know how many of you purchased this wonderful and budget device in Europe but for me in Hungary B7 and B20 bands are quite frequently used for 4G network connection but the phone itself doesn't support them. Thanks to this I've had horrible experiences like refreshing a page 20 times to reach it. I've found a solution and attached the video here.
After setting these I've not encountered any more "connection timed out", "error connecting to network" and such general issues.
P.S: This of course won't add these bands to your phone but will try to use all available network singnals to reach your destined network addresses.
In some cases you can further tweak your connection to fill your needs, avoid page loading problems and such annoyances/signal loss.
If you dial the "number"
Here if you live outside China you should avoid any option that has TD-SCDMA in it for it's a China exclusive protocol that was developed for densely populated areas and is only supported in that country. You may go ahead and test all these options to find the one that works best for you. For me it was LTE/CDMA/UMTS auto. The default was WCDMA only.
- Go to settings app
- Tap dual sim & cellular network
- Choose your desired sim
- Here tap access point name
- Under global label choose your provider and tap the small (i) on the right
- Scroll down to the bottom and set apn protocol and apn roaming protocol to IpV4/IpV6
- Now tap Bearer and check each one except for unknown
- On the top right tap Save
That's it. Now your network should seek all kinds ot connection to provide you access to the Internet.
Now if you want to go bit deeper:
- Copy the provided code (*#*#4636#*#*)
- Now go to dialer app ( The code should be copied in there and all you have to do is to tap on the code)
- It should open a tab that has "Testing" written on the left - top side on it.
- Tap phone information
- Now you see "Set preferred network type"
- Choose the one that fits your country / isp preferences the most
- Rise and repeat till you find your ideal properties