When will Optus allow VoLTE access from phones not sourced from Optus? Surely as VoLTE is a standard it can't be that hard to provide the SIP settings? If you want to make sure that customers don't use the settings inappropriately then bake them into an app that we can install. I'm not interested in hacking the service. I just want to keep on the LTE network, even when I'm on a phone call.
Generally its just a matter of optus "provisioning" your service for volte, they say its automatic but its not. Contact them via chat and request volte be activated on ur account. I had same with an outright samsung galaxy