[TonyHoyle]

Modern call centres are all VOIP - I expect when you call VM 'support' your call travels mostly over IP beyond the initial leg. It's been standard in business for years (much easier to run an all IP network than manage two separate networks).

I run it pretty much all the time.. mainly because it lets me do cool things like having it redirect for free to my mobile, and I have multiple numbers so if a business only has a premium rate support line, I only give them my premium rate number :p