OS information differs for each device. Please see below for more details.

 ■ Checking on Android (Galaxy, LG etc.)

 1. Tap phone's [Settings], and tap [About phone].

 2. Tap [Software information] and check the Android version.

 ■ Checking on iOS (iPhone, iPad)

 1. Tap phone's [Settings], and tap [General].

 2. Tap [Information] and check the version.