Follow one business through four stages, because the argument is easier to see that way than in the abstract. Stage one: a sole trader gives out a personal mobile, answers when they can, and misses the rest. Stage two: they get a business number and divert it to the same mobile, which feels like progress and changes almost nothing — same phone, same missed calls, same personal number appearing on every outbound call to a customer who then rings it on a Sunday. Stage three: they hire someone, and now the number is the problem, because it lives in one person's pocket and there is no way for a second person to help. Stage four: they put in a virtual phone system, and for the first time the number belongs to the business rather than to a handset — it rings two people, knows what time it is, and when nobody can answer, something intelligent has a short conversation with the caller, captures what they want, answers the question they actually rang to ask, books them in, and leaves a summary that takes ten seconds to read between jobs. Nothing was installed. No cabling, no comms cupboard, no technician, and no handsets unless somebody wanted one. That is the shape of a virtual phone system, and for a business of one to twenty people it is now the most cost-effective communications arrangement available. Here is what it does, what it costs, and the three places it genuinely stops.