Download Fortnite for iPhone and iPad (iOS devices). Since launching for mobile, Fortnite has been through several changes in quality of life, which has been designed for more enjoyable game play with less and less hardware. You might even be able to remember when Fortnite ran at only 30 frames per second on the Xbox One or the Playstation 4. Then optimization came along that offered the more normal 60 frames per second.
The Fortnite team is always working on things to make improvements more readily available to players. Most recently, information has surfaced that they are currently working on a way to give you more options in HUD customization that would let you place buttons anywhere you want them. This would allow the ultimate comfort while you play the game.
Fortnite Battle Royale for iOS
The only real problem thus far has been reducing game size for mobile phones that have limited storage space. This is currently something Epic Games is working on.