Vonage sucks. Don't use them. If you do, I'm really sorry.
I've had Vonage for little over a year now. Things were good up until a few months ago, and then the voice over IP router thing they sold me started having issues. I used their online knowledgebase to see what they had and nothing helped. I took packet captures (yeah, I'm a geek, but that's my profession) and there were definately some problems going on with the hardware.
So instead of calling their technical support line, I just call my local CLEC (phone company) and setup a second phone line.
I called Vonage after the fact and they were going to charge me $70 to disconnect. That $70 is to recoup the $70 rebate they gave me on their phone router thing since I was canceling before 1 year. They said if I waited a month, I wouldn't have to pay $70. They also gave me a month's worth of free service, which I didn't use.
So I waited. And the month went by. And I didn't cancel. So they charged me for another month's worth of service. So I called. Want to cancel. No refund of monthly charge, which is $30. And they want to charge me $40 to cancel my service (that was a part of your terms of service - if you cancel less than two years after you started with us). So I'm screwed.
Well, I'm going to dispute the charges with the credit card company. I hope that I can do something there. Dang stinking Vonage. Customer no-service. I'll be glad to get rid of them once and for all.