Last week, Epic Games announced it was bringing Fortnite to Android, making it first available exclusively for Samsung users. That exclusivity was only supposed to last for "a few days" and it looks like now the beta is starting to open up for non-Samsung users as well.
If you're interested in playing the game, you have to sign up for the beta on Epic's website. You'll be able to download it right out of the gate once you sign up, but you'll have to wait for Epic to grant you access in order to actually be able to play it on your device.
Speaking of devices, you'll also need to be rocking a fairly new one in order to handle the hardware demands of the game. Most mid-level phones made by major manufacturers in the last few years are on the approved list, but you'll want to check for yours before going through the trouble of signing up.
You're downloading the beta in APK form from Epic's website rather than an app through the Google Play store, so downloading and installing the app will likely require you to temporarily disable some permissions on your phone. It will also prompt you to enable those again when you're done.
There are a few modified APKs kicking around out there that supposedly make the game work on other devices. We'd advise you not to download one of those and stick with Epic's official version instead for a number of reasons detailed here.
And once you sign up for that beta, be prepared to sit tight for a bit. Like most betas, Epic is slowing rolling the game out to users, so it might be a bit before you officially get access. That said, it always pays to get in the queue early.
Android. Fortnite Battle Royale, one of the most popular battle royale games around, is finally on Android. And you get first dibs with the beta if you own a Samsung device — a list that includes its flagship Galaxy S9 / S9 Plus (and its predecessors, the S8 / S8 Plus); the Note8 (and the just-announced Galaxy Note9, when it arrives later this month); as well as the Galaxy S7, S7 Edge and Tab S3.