The only way at the moment you can trigger this is to upgrade your connection to the Gig1 offer (so higher price, new 18 month lock in), that'll also require that you area has been put onto the DOCSIS 3.1 technology (I'm guessing that's only half of VM so far).
But why do you want a Hub 4? There's no good reasons for changing to a Hub 4 from a Hub 3 excepting a minority of customers in areas of recognised downstream capacity problems, and in those areas VM contact you, not the other way round.
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