Microsoft is looking for iPhone users to test out an early beta version of the Cortana app for iOS, with those interested required to fill out a survey.

“Cortana’s deep integration with Windows means that’s where she can really shine. So, while there are some features you’ll use on Windows that we don’t (yet) support on iOS phones (like saying “Hey Cortana” to wake her up), we’ve focused on making Cortana on iOS the perfect companion to your Windows experience,” the company said in a statement.

“We want help to make sure she’s a great personal assistant on iOS,” it added.

Survey questions include: “How often do you use Cortana on your Windows 10 PC?” and “Which smartphone do you own and primarily use?”.

For now, Cortana for iOS is only available in the US and China. Over the coming months, Microsoft will deliver frequent updates to the app to expand features and functionality.

The company said it will limit access to begin with, and will start sending out download links over email to bring users on-board in coming weeks.

A beta version of Microsoft’s Cortana digital assistant was made available for Android in August, as a companion for Windows 10 PC users, competing against the Android-native Google Now.

Back in May, Sheridan Nye, principal analyst for information and communication technologies at Frost & Sullivan, said Cortana for Android and iPhone is Microsoft’s “third major effort to extend its PC home territory into the mobile phone domain”, having already tried the OS route with Windows Phone and the hardware route with its Lumia devices.