AT&T WiFi hotspot auto-authentication courtesy of OS 3.0

Turns out there’s another feature you might not be fully familiar with in iPhone OS 3.0. It’s called auto-authentication, and if you live in the US, you may even care. AT&T has over 20,000 WiFi hotspots scattered across the globe (think McDonalds) and now your iPhone can access them, for free, with ease.