OK, likely my last post on this topic.
MTN is not offering VoWiFi out of the box, or possibly at all. They claim it only works on certain handsets. I asked them for a list of supported handsets last week. No reply.
I will be leaving MTN as soon as my 1 month port period completes and moving to Vodacom.
Happy to move back to Cell C when they dump MTN as their network operator.
If anyone reading this thread does have MTN VoWiFi please post a response with your handset details and vague location. Thanks