Google Voice does not allow you to pick up a physical phone and MAKE calls, so while it is a great service, it is no replacement for home phones.
I've used Voicepulse, they're inexpensive and fairly reliable but not 100%. A friend has used Magic Jack but switched to Oooma and is happy with it. Magic Jack Plus is supposed to be less reliable than the old service, sadly. With Ooma's "free forever" pricing...I don't know if that's sustainable long term. Google Voice is free for domestic calls, competitive for international, but their terms are not guaranteed forever.
There's another one called NetDuo which has gotten very good reviews
, very competitive prices.
And another friend uses Vonage for his office phones, and that goes out several times a year as well. I'd have to say none of the VOIP phones is going to be 100% reliable the way a POTS line is, but these days?
If you have VOIP at home, plus a cell phone
, you've still got a phone when one or the other goes down--as they both will. If you give folks your GoogleVoice number, and have that forward to both of your other phones, now you've got redundancy. Callers just know one number, and you pick it up on the phone you choose. I'd suggest at least looking at that option no matter which service you choose for the actual VOIP phones.
During TS Sandy, folks in the metroNY area lost
ALL types of phone service at times. The cells were overloaded, the VOIP overloaded or flooded, the POSTS landlines flooded out too. No matter which service you had, some only worked one way (inbound or out) some worked sometimes, nothing was 100%.
I'd also suggest that whatever service you use, you TRY IT for a month before you drop the POTS line, and if you want to keep your old phone number, remember that you have to transfer it BEFORE you drop the POTS service. The transfer can take up to 30 days "because we can" as Verizon says. They're in no rush and they're allowed to take that long.
There are two drawbacks to GoogleVoice:
1-It is a Google product, so there is zero customer service. As Lily Tomlin used to say about the phone company "We don't have to give a damn."
2-You can't disable the voicemail, which will always pick up on the 4th(?) ring.