Meanwhile, I have recently switched my mom's existing Digi plan (ancient Big bonus 28) to the CelcomDigi Kuning 5G 25 plan. She is not really a big data user - she mainly uses Unifi broadband at home for internet (but a heavy talk user) - hence the decision to switch to this new plan. Their previous offering are too expensive for me to switch.

Regarding the 5G 100Mbps speed cap, it is hard capped to close to 97-98 Mbps range while on 5G (tested on Poco M4 5G) despite there are enough capacity to go more than 600-700Mbps (tested using Maxis, posted as a reference) in my area. Of course 4G can go faster than 100Mbps.

I doubt she will notice any difference in terms of speed though. For me I do download heavy files frequently and also a heavy HD/UHD streamer means that I will stick to the ones that offer uncapped 5G speed at this junction (Hotlink, Yes Power 35).

Mysteriously, VoLTE again went missing after I migrated my mom's plan to the new plan and now I have to ask CelcomDigi to reactivate it again.