Why isn't VoIP the dominant form of telecommunication right now?

Why isn't VoIP the dominant form of telecommunication right now?

Jim Gurol (VP of Operations, Tierzero) gives expert video advice on: What is VoIP?; Is VoIP free?; Why is VoIP so cheap? and more...

A lot of times the VoIP providers are struggling to get penetration into the market because consumers are confused about the service, or they don't want to change their phones, or change their phone numbers. But in the beginning, when VoIP came out, there was no way to move your phone numbers over to the VoIP system, you had to get a new number but nowadays, they are doing local number portability, which allows you to take over your phone number into your existing service.