Less than a month after kicking off the Cortana for iPhone beta signups, Microsoft has started rolling out the app to people who showed interest in testing it. As TechCrunch points out, the early build is being distributed through TestFlight, a developer-focused service that lets iOS users try applications before their public release. Based on the app's current description, Microsoft is asking testers to set a Cortana reminder on a Windows 10 PC and see how it works with an iPhone, as well as communicate with the virtual assistant and observe how she responds to queries. Back in August, Cortana also arrived on Android via public beta, so it's only a matter of time before Microsoft officially releases it on Google and Apple's mobile platforms.