SunRocket has sent emails with links to their customers, informing their clients:

Dear Customers,

After significant effort by the Company to avoid this result, SunRocket is in the process of closing its operations and therefore will no longer be able to provide you with the phone service that you have been accustomed to. However, this email provides you with an opportunity to sign up with select service providers who we believe will offer outstanding replacement service

In order to assist you, we have entered into negotiations with a number of service providers. . .”

One of the choices is Packet 8 and the other seems to be brand new:
TeleBlend