“Ooma offers a unique proposition: free domestic calling (you do need to pay $4-$6 per month for taxes and access to 911, depending on your state). The catch is that Ooma requires that you buy its hardware, the Telo box, to access the service.
The Ooma Telo is a flat electronic box with illuminated touch buttons on top. It plugs into your router and a phone plugs into it. It costs $150, or $210 with a cordless phone.”
“The Premier plan (for $ 10 a month) offers many additional features such free calling to Canada, voicemail-to-text, three-way conferencing, filtering of spam calls and more….
An international calling plan provides 500, 1,000 or an unlimited number of minutes of calling every month to landlines in over 60 countries worldwide — but just to mobile phones in 12 countries — for $5, $10 and $15 respectively.”