I think it's safe to say that the LG Star is a GSM phone because a website named GSM Israel made a 7 minute video of it.
Here's the story from Engadget.
LG Star struts its stuff on film, toys with an iPhone 4 (video) -- Engadget
And here's the video on YouTube.
http://www.youtube.com/watch?v=cULT5ZeI44s&feature=player_embedded
If anybody speaks Hebrew please feel to translate.