Player Unknowns Battlegrounds is one of the famous games today. 100 Millions of players are enjoying the game today, some are enjoying it on the phone some are enjoying it on their laptop or PC.

Minimum hardware and software requirement to play PUBG on Mobile on your Smartphone:
Android: Android 5.1.1 or later and at least 2GB of RAM

iOS: iOS 9 or later running on iPhone 5s or newer

However, these are the minimum requirement to play PUBG on Phone, but to get the best  experience of this game you need the following requirement :

For Android:
OS:  Android 5.1.1
Screen: FHD display with 5’+ screen size

On the other hand, if you are using an iPhone, you should use the iPhone 7 and above because older iPhone may be slow.