Any idea when Maxis will support VoLTE for MultiSIM?

Side question bro - are you able to swap the profile on your current main phone from primary to secondary and on your backup/other phone swap from secondary to primary profile (toggling the profiles)?

From what I heard if VoLTE is activated for MultiSIM then you might not be able to swap/switch the profiles on your devices (making primary phone as secondary and secondary phone as primary).

Usually the main usage of multiSIM is that you can designate a phone as the phone with the primary profile (which receives incoming calls and SMS) and a 2nd phone with a secondary profile (for sharing data, it doesn't ring).

For MultiSIM you can change/swap the profiles of the phones (from primary to secondary OR secondary to primary etc) by entering some USD codes (via *100#) instead of physically swapping the SIM cards in each device. By swapping the profile you can make your previous secondary phone change to the primary phone without the need to physically swapping the SIM cards, you just enter some key pressed via USSD and voila it gets swapped.

But indeed this feature is not really used widely as primary devices remain primary, and secondary devices remains as such (for data sharing/leeching mostly). Having said that I've not tried before if my secondary phone will ring if my primary phone is turned off

In any case, I'm using my primary phone with the primary e-SIM MultiSIM and my secondary device is using a physical MultiSIM card, so the MultiSIM works as an e-SIM as well.

Not sure if they have limited it now or not - but when I got my MultiSIM some time back last year (Feb/Mar 2020) - I changed my primary SIM to an e-SIM (to use with my new iPhone XS) while the secondary SIM is a physical SIM (with my iPhone X that doesn't support e-SIM).

Having said that I tried to access the profile change selection via USSD (*100#) "6 MultiSim 1 Line" and it stated "This service is currently unavailable"

Thanks boss.

I was searching and I also found the following MultiSIM USSD codes:

*134*1*0000# Set Primary SIM
*134*2*0000# Profile Query (to check which SIM is designated primary/active SIM)
*134*3*0000# SIM Profile Query (to determine which is the current handset and active handset)

If I don't intend to switch my phone profiles between primary & secondary, do you think it is ok to call 123 to activate the VoLTE?