i got unifi mobile as my backup number previously b4 porting out.
it's pretty alright when area covered by 4G.
when it falls to 3G, actually running on celcom network as non priority traffic, & bcom shitty.
hated the 3G & 4G data quota segregation.
though i'm not sure how it goes now after 3G network was shut down.

it actually also very much dependant on the building got install telco signal booster o not.

unifi mobile hav access to 850mhz spectrum, which is good for penetrating building, but still shit nonetheless.
YES does a better job in this. (800Mhz spectrum)