Google Voice the very cool invite-only calling wrapper that used to be called Grand Central, can now be controlled directly from the iPhone with the Google Voice Mobile application. It’s pretty fantastic.

The application costs $3 and is just designed to interface with Google Voice. You can dial directly out from your GV number (either using the dialpad or through your normal iPhone contacts list), send texts from your GV number and access your Google Voice number’s voicemail.

GV Mobile goes beyond old functionality and takes advantage of Google Voice’s newest features. You can SMS right from the application, listen to voicemails left to you on Google Voice and you can change your Google Voice settings on the fly oh-so-easily.The functionality is awesome.

The SMS feature is pretty great as it allows you to send SMS with absolutely no fee from Google or AT&T. Simple click on the SMS tab at the bottom, type in a number or hit the “+” to access your contacts. It couldn’t be much easier and your Google Voice number is displayed as the sender. The only downsides are SMS’s sent to you are not accessed by the app; instead GV forwards them to your cell number, where you’ll pick up the charge.

Changing settings requires nothing more than a tap to change phone numbers to forward calls to numbers to call from, adding phones and changing log in info. It is all very slick and well done. Having this ability is quite handy when you are on the go.

Text and calls go through properly and voicemail is as close an approximation of your iPhone’s visual voicemail as it gets. Fairly accurate transcripts of your voicemails can be sent via text to your phone as well. History is funky, however, since it shows “Unknown” for all my calls. You can control which phone numbers incoming calls dial and also which phone you want to “call out” from.

There is also a free verzion that allows that allows you to just dialing, which is good enough for most people. The pay version is here.

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