I am afraid this is not a service that VM offer for their mobile customer, there are a few services out there that will allow you to set up a conference call the main one I found was whypay it is free.
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Is it still true that we can't make conference calls on our Mobile Virgin Media service?
Just the other day I asked this question on the 789 service and was told that I should be able to conference call, and the problem is with my phone. I know this is an old thread, but I found it as a result of a web search to find out what could be wrong with my phone. However, maybe the 789 service is wrong?
My need is to make a conference call that includes my mother's landline number, which WhatsApp can't do, and for which Skype incurs extra charges. I need to use this feature, which is fundamental to other services providers, on my mobile phone service.