said by Packet8 rep :

There should be no problem porting to Packet8. Most of the numbers are owned by Level3 for both SunRocket and Packet8. I expect we could port the number very fast (maybe just a few days or less). Packet8 is operated by 8x8, a company that has been in business for 20 years and it is financially strong (almost cash flow break even in its VoIP phone service in the March quarter).