M21 autoswitching from 4G to 3G

[Amitanshu]

My recently bought M21 device autoswitches between 4G network to 3G and I have to manually adjust the network back gain to 4G.It happens quite a lot,around every 30-45mins.I talked with the customer care and they suggested me that it might be an issue from my network provider and suggested to switch on the call roaming.By default my 4g mode shows LTE/3G/2G and can't choose 4G or LTE alone . I'm currently using Vodafone(now VI) as default in Sim-1.

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Pls share any troubleshooting advice or any settings operation guide.

[Ehsank]

this is service provider network issue, you didn't have "lte only" option?

[Amitanshu]

No It's showing LTE/3G/2G (autoconnect) only

[Ehsank]

which is your 2nd sim?

[Amitanshu]

it's BSNL

[Ehsank]

i think lte only option is also depends on sim, as i have jio it allows to set lte only

[Amitanshu]

Yeah....That's because Jio comes by default in 4G only and has no 3G or 2G to downgrade.

[Anikroyale]

It has 3G and 2G downgrade.

[Sagarsamsunguser]

use band selection app https://play.google.com/store/apps/details?id=com.ray.samsungbandselection

post your querries on xda for fast resolutions 

https://www.xda-developers.com

[Amitanshu]

Thanks....It works till now.It kinda forced the inside settings to LTE only