How to know the BlackBerry OS version?

From Home screen, select "Options" icon. Then, choose "About".
Mine shows somethings like this:

  BlackBerry 8320
  smartphone(EDGE,WiFi)
  v4.2.2.180 (Platform 2.5.0.36)
  Cryptographic Kernel v3.8.4.47

BlackBerry OS has version number 4.2.1 or so. This device looks like to have OS version 4.2.2.