The Operating System Version currently installed on your device can typically be found under the Settings menu for your mobile device. Refer below for platform specific instructions:
1. From the Home Screen Tap Settings
2. Under the General tab, select About
3. The Operating System Version number is listed next to Version
*NOTE* The look/layout on your Android Device may differ slightly depending on device manufacturer and operating system version installed.
1. From the Home Screen, tap the Settings Button and select System Settings
2. Scroll to the bottom of the list and tap About Phone
3. The Operatin System Version currently installed is listed under Android Version