I’m from KK. If KK city area, Maxis and Celcom internet speed sometimes you even can get over 100 Mbps but digi internet speed still not bad (at least no noticeable slowing issue except if there ). But if 1 borneo/ sulaman area, I think digi performance is better over there since Digi performs very well at Menggatal area which is quite near to 1 Borneo (I ever got like 100 Mbps Speedtest there) but Maxis and Celcom performance should be not bad also (Celcom I know at least also got like 30 Mbps download speed there).

But if coverage on any telco should be no problem if you just stay around city. But if your are going for a day trip to some small town like Kota Belud, Tambunan etc which all the roads are surrounded by hills then you might suffer “emergency calls only” on your phone. Got one time I’m having a road trip to Kota Belud, during the journey, my dual sim phone which I’m using digi and yoodo (Celcom) SIM card. I did experience the yoodo sim could get any signal in some places (emergency calls only) but my digi sim still got 3G signal.

Maxis should be not bad lah in kk...rarely heard from my family or friends complained about maxis. But of course you can just get a dummy sim like other people to test out if you want to mnp to maxis.

P.S.: This is just my personal experience

https://www.maxis.com.my/about-maxis/maxis-network/volte/

Seems like Maxis is the first telco in Malaysia that officially support volte on xiaomi phones.

Now only Maxis/ Hotlink postpaid users can enjoy volte on compatible devices.

If not mistaken your phone will display as "MY MAXIS".