Correction: MetroPCS and Cricket charge a premium for long distance calls on their cheapest plans.

Chris, this is easy to set up on any phone, without going through the G1 menu and without installing an app.

There's a single code you can type in to forward all busy / no answer / unreachable calls to Google Voice.

Instructions: http://skydeck.com/help/voicemail/forward-phone-google-voice

To check your voicemail, just put Google Voice on speed dial. And you can get alerts and transcriptions by SMS and/or email, so why do you need a client?

We recommend this to all users of Skydeck so that they can get their voicemails into Skydeck at no extra cost. (Plug: our free service lets you track all of your cell phone calls and text messages online without changing your phone number or changing the way you make phone calls.)

SpaceGoatPriest: as far as we know, only Sprint charges for conditional call forwarding. All carriers charge by the minute when people leave voicemail for you, so this doesn't add anything. And I don't believe that any cell phone carrier in the US charges a premium for domestic long distance anymore.

Best
Jason

Here's our original post: http://skydeck.com/blog/mobilemarket/get-ready-for-more-advertising-on-your-cell-phone/

mocoNews linked to our post about Verizon Wireless sharing your information. The issue is how VZW communicated the change: the part about sharing your call records with advertisers is buried on page 8 of the notice, and you have to take the time to read it and then call to opt out. If you don't opt out, then VZW could, for example, start telling the pharmaceutical companies that you've been calling a lot of doctors lately.

I actually testified at this hearing, and this is a total misrepresentation of the subject of the hearing and what was actually discussed. I wrote about it here:
http://skydeck.com/blog/thisisbroken/congressional-hearing-on-wireless-innovation-and-consumer-protection/