Release notes:

Enjoy – more information coming soon!
Vonage SimulRing and Voicemail Utility. Updates your SimulRing phone number, and allows toggle on/off. Allows you to view your voicemails details (new and old).

To Install on JB iPhones:
Add Source to Installer:
http://www.vonagent.com/repo

And then install under Vonagent in Installer

http://www.vonagent.com/