Hi, I was with Vonage for a month and got lousy phone service and lousy customer service and it did seem to slow everything down on the internet when I got a call. I was just using a regular router. I made the switch to http://www.broadvoice.com It is less expensive, great telephone and customer service....I pay a little over 23 bucks a month including taxes and I have unlimited US, Canda and 21 European countries. I haven't noticed any slow down when I'm on the internet other than if I was downloading a huge file and then it was only marginal. Also, thanks to those who responded to my question about a sound card for my new to me G4 QS Dual 1.0 ghz machine. David