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Yeah I agree. Thing is that when 3 have activated ( I was with 3 at the time) it I remember they put it on the blog and and sent an SMS, we knew about the new feature.
Maybe it will be communicated next week, could be.
Also don't forget that VoLTE is not new to Vodafone. It's only new to us iPhone users. Makes up for the fact that we had Wi Fi calling a lot earlier than Android handsets.