If I see a off-white box with Celcom logo (looks like telecom fiber box) means Celcom run their own fiber infra to my area?

Or borrow unifi because next to it is TM box that looks larger.

Edit:those boxes that you see by the roadside near tamans

Yep somewhere Sabah. If real fiber infra then might consider combining phone and internet bill together with some of their new combined plans.

Edit: Tho not sure what I lose if switch to CelcomDigi, I think unifi technical support is somewhat better in bringing back a problematic connection. A real concern since in another place Unifi cable frequently hit by large trucks (4~5 times a year) and after I do live chat unifi contractor come fix it for free quite fast.