Hi. I'm currently using starhub in sg,i have tried on other brands of mobile phone thats support VOLTE, I'm able to enable it, but no option in my zenfone 8 and probably not support VOLTE in sg. When I'm on a call and not able to my 4g to check in and out ..is really kind of frustrated ..i hope asus will include VOLTE for Singapore telco in the near future or next firmware update. Thanks alot