Hi @Pmc1
There is no obligation to have a landline with Virgin in order to take out broadband, however having one generally attracts a higher discount, hence a lower price as they hope you'll make chargeable calls.
There is no need to plug a phone in if you take that option, although if you have any broadband issues you can plug it in and dial 150 from the landline (free call) to speak to Virgin.
EDIT - In case I've misinterpreted your question, VM would prefer a landline/mobile to contact you on if there are any issues with the installation, although they may also be able to send emails to you.
DaveI don't work for Virgin Media.
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