https://www.gamespot.com/articles/fortnite-mobile-gameplay-shown-off-for-first-time-/1100-6457339/

Epic made a surprising announcement recently when it revealed that it was bringing Fortnite's incredibly popular Battle Royale mode to mobile, complete with cross-play. With a beta test coming up on iOS and sign-ups now live, Epic has provided us with our first look at the game running on mobile.

As noted above, you can now sign up to participate in Fortnite's upcoming mobile test. It will only be available on iOS initially, although Android will come later. Players can opt-in for cross-play with PS4, Xbox One, and PC, allowing them to squad up with friends on other platforms--provided you want to.