I called it "VONAGE HADES"! It was horrible! I would NEVER go with Vonage again!
For 6 weeks they messed up my fax line, sent some idiot to "service" the issue, and for 6 weeks all I had was issues. My fax would not work, there were cords everywhere and anytime I called "customer service" (and I use this term loosely) I spent at least 1 hour on the phone.
Oh, and here's the clincher! They "forget" to tell you that
once you switch to their system, your telephone runs through the internet . . . so your security alarm (which runs off of the phone land line) NO LONGER WORKS!
After 6 weeks of Vonage Trauma, I called their "customer service" line and told the little snit on the phone I wanted out of their plan. He told me, "Well, we will have to charge you a disconnect fee since you have gone over the 30 days". I am sure his ears are still ringing from the screech that I produced!
And sure enough, within minutes my credit card was hit with over $120 in charges! I lost it! I called the bank and they immediately got every penny I ever spent with Vonage back.
Here was the reason: In the agreement, it states that they will provide "service". When I had issues from day one, that was not "service". I gave them 6 weeks of chances. Therefore, they were in
breach of the agreement! I held up my end of the bargain by paying them, but they breached the agreement by not providing the service they promised.

I got my money back and have never heard from them again.
