I have AT&T CallVantage, which is almost the same as Vonage. I had a few problems at the beginning with packet loss - turns out my cable modem was a bad model. It can be difficult to work a problem with two companies (VoIP provider and ISP) but if you keep on top of things it turns out ok. Some cable companies are bundling voice deals in with internet service, Time Warner and AT&T have this deal in my area. Just compare prices and features, I especially like the web-based controls for my phone service. I can get my voicemail e-mailed to me, or have all my calls forwarded to my mobile, etc.