Up till now I have been using a cell phone as my business phone so that I am always available to the customer. I am considering adding a dedicated phone number in the office to be used as the business line which would forward to my cell if I wasn't in the office.

A company called Vonage offers a VOIP service which includes unlimited calling plus a dedicated fax line for a good price. The tradeoff is that is works over the high speed internet connection. Does anyone else use this type of technology for their business phone service ? If so, how is it working ?