PUBG Mobile requires iOS 9.0 or later, and supports iPhones as far back as the iPhone 5S (though an iPhone 6 is recommended). as that only supports iPhone 6S and newer.
The Android version supports more than 500 different Android devices, according to the Google Play listing, which recommends using a device running Android 5.1.1 Lollipop or later with at least 2 GB RAM.
PUBG Mobile is available for free, and the game is rated 17-plus.
It’s a 892.7 MB download on iOS and 700Mb on Android.