This hub works with your high-speed Internet and your home phones to deliver VoIP phone services and supports up to 4 Ooma Telo handsets. With easy setup, you can enjoy unlimited U.S. calling and low international rates.*
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I have FIOS with Verizon and checked out the service quality in advance to make sure it would support voice over internet, which it did with no problem. Setup was very simple; just plugged Ooma in to cable modem and was making calls 5 minutes later. After a week of testing dropped land line and all jacks in house now running off Ooma. Bills for phone+internet now down from $86/mo to $50/mo. Figure will recoup costs in 7-8 months.
Major issue above competitors is that call quality is same or better as landline (exception: if volume up loud on handset, you get an "echo". Turning volume down ends this) and computer does not need to be on to run it.
Only caveats are: not completely set-and-forget, needed minor tweaking to not slow down internet connection (all answered on Ooma's website). There are small tax fees which you still pay (about $3.50/mo). Be aware that there is a $40 fee if you want to port your old phone # over (don't need to decide this right away). Strange dial tone which still takes getting used to. These are all minor and very happy overall with the transition. No one can tell it is a voice-over-internet connection instead of a land line.
What's great about it: Just plain works with high call quality