With the number of content providers that keep coming on board with Chromecast, the next big step for Google is making the device a bit easier to use. Case in point: Today marks the launch of ultrasonic pairing -- otherwise known as "Guest mode." All you need to do is enable Google's streaming stick to connect to a nearby device and voila: Now anyone can cast to your TV from their Android, no WiFi password needed. For now, it's exclusive to Google's own OS, but there's a reason for that. Chromecast product manager Jagjit Chawla says that with iOS, you can't scan for a list of nearby WiFi access points because there isn't an API that'd allow it. Thus, Guest mode on Apple's mobile software isn't going to happen right away. "Either we can solve these tech problems, or, we can release it on Android first, gather user feedback, improve our back-end and find solutions," he said, with the goal of reaching iOS feature parity sometime later.