Customer service told me it's not a high priority!! When I said people will mostly have 4G phones soon and expect to get that speed having bought an upmarket phone she said it doesn't make difference and there isn't much demand for it!! That's not my experience from using other's 4G internet connections with EE for example. I for one will leave in the near future if there is no definite date for 4G sometime soon.
Customer Service told me they would be getting 4G later this year when I phoned to cancel my service. The same LIE they told me when I cancelled my wife's line last year at the end of that contract. Let them know with your feet! Weirdly at lot of people have a loyalty to the Virgin name, I did. Still keep the broadband and TV but not the mobile. I'm with Three now, terrific 4G, better than my Superhub 200mb puts out on WiFi