Google Voice by Google, Inc.

Access your Google Voice account right from your iPhone, iPad and iPod Touch.
Send free text messages to US phones and make international calls at very low rates.
Access your voicemail messages with transcription.
Make calls with your Google Voice number.
A Google Voice account is required to use this app (sign up for free at google.com/voice).
Google Voice is currently only available in the US.
When using Google Voice for iPhone, both domestic and international calls are placed through a US-based Google Voice access number, and will use the standard minutes from your cell phone plan.

- Bug fixes