It's a long since I have worked in this business, but isn't that to make this kind of hack you need to access a telecom network? Or is it possible that some vi

It's a long since I have worked in this business, but isn't that to make this kind of hack you need to access a telecom network? Or is it possible that some virtual network operators are rogue entities? In this case, isn't the problem larger than holes in SS7 ?