Epic games has just announced that Fortnite on iOS is now available for everyone, with no invite code needed:
No invite needed – Fortnite is now open everywhere on iOS. Grab your friends and jump in now! https://t.co/qU3S8QAQ9K
— Fortnite (@FortniteGame) April 2, 2018
You can download Fortnite for iOS here
Android support is coming within the next few months. If you are on an Android device, please click “Get Started” to sign up. We’ll notify you when your Android device is supported.