Even though I am on recently released B131 software which states in the changelog:
"Adds the VoLTE feature. Please consult your local carrier to find out if it is supported." ??
Thank you for exploring further, I could never get VoLTE working on my Mate 9 and I was hoping (assumed) it would work on the newer Mate 10 :crying:
Edit - just been in touch with my carrier, Optus, and they confirmed VoLTE was already activated on my account/sim and they re-activated again just in case. Restarted phone and still no VoLTE option in the menu settings.... So Huawei say VoLTE is enabled on my phone, my carrier says it is enabled, but it appears not