How can I see 3gp files on my phone?

Hi, You should be able to play them with either Wind MMS or more easily using the 7650 video recorder released last week by Nokia. Go to their web site for this.
At a guess I'd say your recording with Hipcam and cannot view the recorded clips? Same problem I have to with that program. I brought it and am still waiting for the new version with a built in player, the ten days I was told i should get it in has long since gone. Still go things come to those who wait. Hope this helps?