"Call of Duty: Mobile" will launch for free on iOS and Android on October 1.

The game will be focused on online multiplayer, and incorporate popular weapons, maps, and characters from past "Call of Duty" games like "Black Ops" and "Modern Warfare."

While "Call of Duty" is still one of the best-selling video games on the planet, the mobile version will compete directly with "Fortnite" and "PUBG Mobile," two battle-royale shooters with massive audiences on mobile devices.

"Call of Duty: Mobile" will also include a Battle Royale mode that supports 100 players at once.

Visit Business Insider's homepage for more stories.

Activision has confirmed the release date for "Call of Duty: Mobile," the new game in the best-selling franchise coming to Android and iOS. The game will be released for free in the Apple App Store and Google Play Store worldwide on October 1, with the exceptions of mainland China, Belgium, and Vietnam.

The "Call of Duty" franchise is a perennial best-seller, delivering new games to tens of millions of players each year. Every "Call of Duty" is a war-based first-person shooter, but there are separate series within the franchise, including "Call of Duty: Modern Warfare" and "Call of Duty Black Ops."

Read more: This year's new 'Call of Duty' game was just revealed, and it arrives in October — here's our first look at what to expect

"Call of Duty: Mobile" will bring together popular maps, weapons, characters, and game modes from those different series for free.

You can pre-register for the game on Google Play, or visit the official website to get email updates.

Here's what we know about "Call of Duty: Mobile" so far.