Access your Google Voice account right from your iPhone, iPad and iPod Touch.
Send free SMS messages to US phones and make international calls at very low rates.
Get transcribed voicemail—save time by reading instead of listening.
Make calls with your Google Voice number.

A free Google Voice account is required to use this app.
Google Voice is currently only available in the U.S.
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.

What's New in Version 2.5

This version:
Enable high contrast mode (no message bubble fill color) in grayscale mode
Reply to messages from notifications
Bug fixes

Previous version:
Delete an entire message conversation
Access "Do not disturb" more easily from any screen
Copy voicemail transcriptions and share images from your conversation easily
Save a tap -- the app remembers the last tab when being relaunched

Verdict

Free phone calls, text messages and a voicemail system that all works as it should do- what's not to like?