Thanks all, its not there on my Samsung Galaxy S7 SM-G930F (settings\network and internet\mobile network\advanced)
I am with ee in the UK, VoLTE is supported from what I can read.
As an aside, I’ve wanted to get SIP working on my phone.
Reading ee community posts, it appears there is some confusion, VoLTE is 4G, which is LTE ?? … or is VoLTE voice data over a WiFi network, rather like an IP phone - which uses SIP, I am also confised … I have a SIP Softphone on my laptop, which connects to a VOIP Provider.
So does WiFi calling use my GSM provider (ee) to route calls received via a WiFi Router, in a similar manner to my VOIP Provider ?
I see my /e/OS has SIP Functionality built in:
I’ve tried it, but am getting time out errors, I will check my providers settings.