Sony has revealed new functions and big-name games to reignite interest in its handheld PlayStation (PS) Vita console.

The Japanese firm recently cut its estimate of how many of the devices it expected to sell before March 2013.

It can now be used as a controller for the larger PS3 console and players can switch from a Vita to a mobile phone and continue the same game.

Users buying some PS3 or Vita games can get free versions for the other device.