Q: Can we keep our current phone number with Vonage?
A: Yes, you can! During the Vonage World (and Vonage Lite) signup process you’ll be asked if you want to transfer your phone number over to Vonage. If so, Vonage will initiate a number transfer for you. The number transfer usually takes about 10 business days, and Vonage will issue a temporary number in the interim so you can start using Vonage right away.
You should keep your existing phone service and phone number until the transfer is final. During the number transfer process, calls made by non-Vonage customers to the number being transferred will ring on your non-Vonage phone line. After your number transfer has completed, all calls will go directly to your Vonage phone line. If you’re curious and want to know what the status of the transfer is, you can easily check via the Vonage Online account you’ll receive once you’re a Vonage customer.

[...] You have 2 different options when signing up for Vonage. The first option lets you transfer your existing phone number over to Vonage (where available). The actual number transfer process may take up to 10 business [...]