My uncle was an early supporter of Ooma and my parents have a box that provides their landline number that they've had for 25+ years, and they don't pay anything in terms of a monthly fee.
In spite of how great of a deal it is, the spam calls have gotten to be so bad that my parents are considering getting rid of it. It's not worth the hassle, even when it's essentially free. At least half the calls that come in are spam.
(Quick aside: Ooma deserves praise for their product. I hope they succeed and can pivot properly to other products as telephones naturally die. They contribute back to the FOSS Asterisk project and their products are reliable.
Here's a cool blog post I've come across where someone hooks their Ooma box into a local server running Asterisk. You could probably do some really cool home-automation with this: http://www.adrianandgenese.com/blogger/2010/04/23/how-to-set... )
Most of the calls are from "one way funding" and "this is shelly, your local yahoo and google listings specialist."
Kaiser also leaves me voicemails in English and Spanish, and sometime waits for me to press a number. Very annoying.
I've had a Google (Voice) number for... hard to even say now, 8 years? And i.. well, i think i've only gotten a few calls to that number, ever.
In fact, i have a normal cell number (i don't link my google and cell provider numbers), and i get texted spam to it maybe twice a year, but i can't recall anything really.. ever, to my Google number.
To my knowledge i don't have any anti-spam settings enabled on Google Voice (though, they do exist). I wonder what the root cause for this is?
I often forget that "in this day and age", call spam is still an issue.
I haven't had a landline since we got one in college, in the early 2000's, mostly because it came free with the internet service, and I was going to plug in an answering machine with amusing messages.