Optus say that the Huawei mate 9 does not support volte, I called Huawei au and they stated that EMUI 8 now support volte Optus told me 3 times that they had adjusted their end and reboot the phone to take effect,but volte is still not available. Hicare even says it is available. Come on Optus get your act together.
Solved! Solved: Go to Solution.
Although the mobile has VoLTE capabilities, it hasn't been made compatible with the Optus network yet. The list of compatible phones is increasing so hopefully it's added soon, you can keep an eye on this page for updates.