Speed is better than umobile gx30 but too bad yes coverage were super limited, doesn't even have roaming with the big three telco, like umobile roaming with maxis. Going outside coverage then gg no signal. Aren't really suitable for mobile usage at the moment.

Yes4g works fine on my redmi note 4x, even detected signal on band 20 while on gsmarena and kimovil the redmi note 4x aren't listed as supporting band 20. Maybe because I'm on custom rom and it unlocked the band, not sure. All working, data, sms, volte calls.