DALLAS --- AT&T announced the availability of its location-based services app -- AT&T Navigator -- on iPhone 3G and iPhone 3GS. 

Using the latest iPhone OS 3.0 software, the app brings full audible and visual turn-by-turn navigation service over the AT&T 3G network. 

AT&T Navigator provides such features as map updates, speech recognition, ETA updates, more than 10 million business listings, real-time traffic alerts, one-touch rerouting, daily gas prices and more. 

"AT&T Navigator has been one of our most popular and best-performing apps since we launched it last year," said Mark Collins, vice president of voice and data products for AT&T Mobility and Consumer Markets. "With the new iPhone OS 3.0 software, we're expanding the advantages of true turn-by-turn navigation -- both voice and on-screen directions -- to millions more customers."