You can transfer your numbers, don't have to lose them due to the number portability act!!
I don't know if my referral link code will work.. but if you sign up for Vonage based on my advice, why not let me make something out of it?

I've been using Vonage for over 3 years very happily.
http://www.vonage.com/?refer_id=8pac0tneonnc811pn2n1
Brad