Yesterday I port in to Digi from Yoodo
My area have 2CA with 1800+2600, speed test at my home 80Mbps dl with 30Mbps ul, not bad

Key to activate VoLTE & VoWifi on my Mi 11t pro
Not only turn on such settings in Android
For the first time, you need to find an supported iPhone (for my case is iPhone, may be others phone will do), insert the SIM, turn on VoLTE and VoWifi from there, then will receive SMS says "VoLTE service activated"

after that , put back the SIM to android phone, then VoLTE & VoWifi will appear, no need to contact CS to activate.
and I just find out, Prepaid NEXT seems not eligible to claim 1GB productivity.

and for Today only, 1st Dec
reload credit from Pahang Go app using Grab Pay with promo, pay RM70 get RM100 credit.