Switching to WP? Use Google Voice? Free client inside..
Like the topic says: if you are considering switching to Windows Phone, and you need a Google Voice client, we'd be happy to offer you some free promotional codes for MetroTalk. These allow removing the ads from the trial version, thus converting your copy to an exact match of the full version. No expiration or limitations whatsoever.
As it stands, the main missing feature from the app is VoIP calls, due to how difficult that was to implement in WP7. You can expect many updates arriving after WP8 is released though; more on that, in the next few weeks.
For more info, you can take a look here: http://www.windowsphone.com/en-us/store/app/metrotalk/e29cf7f0-dcae-438e-ac88-d3a8d35b7fc5
If you are interested, please send an email to firstname.lastname@example.org.