Google Voice is free service from Google with lots of call features, voicemail transcription, screening, call-blocking, SMS support, conference calling and GOOG-411 integration.
The GVdialer application enables users to make calls using their Google Voice account directly from their mobile phone's native contacts, call log and keypad.
Here are some features.
Users can either download the free trial version of GVdialer or the full paid version. The free trial version is limited for 30 days and includes all the features of the paid version. The full paid version has a one time fee of $9.99 and includes all future versions and features. iPhone users can purchase the GVdialer paid version for only $2.99 from Apple App Store which includes future version updates.
The GVdialer application is already working on hundreds of phone models and new models are being added on weekly basis. Additional Google Voice features are expected to be added to the current version in a few weeks so users will have even more benefit by using the GVdialer.