There are plenty of paid replacements for Google Voice, so a Twilio one would fit right in.

However, I suspect it's the free aspect that everyone's bemoaning. :-)

I haven't seen a lot of voice to sms services, or SMS forwarding. Getting SMS-enabled voip trunks is hard, or at least was hard the last time I checked (admittedly a few years ago)

Pretty sure that's a twilio api.

I had been thinking of that, though Twilio's pricing would probably be prohibitive. They actually charge more than my cell provider for minutes. But everything you'd need is right in the API.

Yeah, it wouldn't work with free, since even their (whatever) -> client is 1/4 c/ minute.

My concern isn't really about the money, though the free calls through voice are nice. It's that Google voice has my number now (as a gizmo refugee), and that + a voip provider + cell provider could be condensed down to twilio on the desktop and wifi, and maybe cell data on a tablet, or prepaid cell as a backup.

The $1/month for a number isn't bad, international sms is awesome for my use case.

I'd be willing to pay something on the order of ~$8/mo for what Google Voice offers, especially if you added better filtering and an API. But I wouldn't pay more than my cell phone bill.