Will I lose my existing number? I like it so much and I have thousands of business cards with my number on it.

Generally speaking, we are able to offer a porting service, which means you keep your number. There are, however, a few telephone companies with whom we do not have porting agreements (or they don’t offer the service). In such cases, you will be assigned a new number. Porting takes 2-3 weeks, and incurs a small once-off charge for the setup.