Calculate what it would have cost for a years service with your previous phone company.
Calculate what Ooma has cost for the same period.
If the Ooma number is less than the phone company number you are ahead.
My last bill from Vonage was $40.32.
That's $483.84 a year.
My Hub cost $249.99.
One year of Premier service (in January 2009) cost $99.99.
The total is $349.98.
I broke even 8.7 months into the year.
All service past that point is saving me money over what I would have paid to Vonage.
Telo with 2 Handsets, a Linx, and a Safety Phone
Telo2 with 2 Handsets and a Linx