And about enabling your 3G - I don't think there is anything "3G" about the images.
Try this command line command:
The first will show you all active InterFaces that are configured, the second will show you all InterFaces that are configured, even if not active.
You are looking for interface ppp0
OR, just post the output of both commands, we will read it back to you.
Are you within range of 3G service?
Have you done anything to the 3G card? (either physically or via software)