You would need to buy Freephoneline’s VoIP unlock key for $89.95+taxes first.
Device PDF setup guide can be found at
http://forum.fongo.com/viewtopic.php?f= ... 333&p=7603.
Although it's possible that others may be able to help you configure your device, I'm unsure that I will be able to since I've never used one.
Fongo Mobile can’t be provisioned on an ATA. You can only use the Fongo Mobile smartphone app.