I have had Vonage for a while now and earlier poster is correct - it is almost $35. I am canceling it this week.
Here's how I use my OBI110 as my new home phone and international calling service
1. Set up free Google Voice number (who doesn't have it already!)
2. Configure Google Voice to work with OBI110 (takes les than 5 minutes - instructions are everywhere)
3. Buy $10 credits from Google Voice (this gives you 500 minute talktime to anywhere in India, including Mobiles)
4. Call from home phone connected to OBI110 OR OBIon app on iPhone (iPhone app doesn't use your cell minutes and works flawlessly on WIFI)