phone model no support or plan no support... lol

I used CelcomDigi for 15 months as main line and Maxis as secondary.  Then I swapped my Maxis to main line after 15 mths because CelcomDigi prefers to connect to 4G network rather than 5G when compared to Maxis.  My guess is CelcomDigi has to pay DNB for every GB data, therefore,  they rather connect its subscribers to its 4G network.

Even when I was with CelcomDigi, their network not stable and always have connection issues.  After I swap to Maxis as my main line, all these issues gone.  Maxis is not perfect but they are much more stable and better than CelcomDigi. So, if your office/residence has good Maxis coverage, then I advice you to port to Maxis. You will see the difference. This is based on my personal experience with CelcomDigi for 15 months before I ported back to Maxis.

i can confirm it is not coverage issue. traveled to whole malaysia in last 2yrs. all location lock 4g+ only.  lol.
2 times change to new sim (advised by bluecube) but still same no 5g.

have another 5g phone + same plan at home.. anywhere go can see 5g. even at home. 

It's listed here

https://help.celcomdigi.com/support/solutio...isclosure-sheet