Does anyone have any success stories or horror stories about their experience with VoIP? I am really tempted to cut my ties with the phone company and go this route.

Vonage service is $25 per month, and my ISP offers VoIP service for $37 per month. We currently pay MCI about $70 per month for unlimited local and long distance, which includes all taxes and fees.

One of my big concerns is number portability. I know I can transfer our current home telephone number to whichever VoIP provider I choose, but since VoIP providers are not regulated, I am worried that I would not be able to ever move my number from them once they have it.