AT&T today announced it will support auto-authentication for iPhone OS 3.0 users connecting to AT&T Wi-Fi Hot Spots. Auto-authentication allows iPhone users to seamlessly switch from AT&T’s 3G network to an AT&T Wi-Fi Hot Spot without being prompted.

The new process eliminates the previous two-step authentication, making it easier and faster for iPhone customers to connect to AT&T Wi-Fi. Auto-connect is established once a customer connects their iPhone to an AT&T Wi-Fi Hot Spot the first time.

The new auto-authentication process is available starting today to all existing iPhone and iPhone 3G customers who download the free iPhone OS 3.0 software update via iTunes. It will also be available to all iPhone 3G S customers once that product goes on sale on June 19. Meanwhile, all iPhone customers can continue to get AT&T Wi-Fi access with the current authentication process.