I bought a second number online. Its pretty easy from the drop down in vPanel. I think its under features, virtual number.
Once I figured out I liked the service, I submitted the number transfer paperwork. For me, the process took a little over a week to get the paperwork straightend out, and then about five days to get the numbers ported from AT&T. I went from $80/month to about $8/month, and Voipo works great.