The phone camera, in most cases, is of good use when you want to take pics and your bulky camera is not around :) It also serves as a great timepass.
For example, when stuck in a traffic tam, and its raining. No more boredom and frustration. Just click and experiment with diff modes and effects of the phone camera. Of course, you should be a passenger and not the driver for this ;-)
Waiting for food in a restaurant? Different or colorful surroundings? Chance to kill time again with the phone camera.
The 2 pics below are at one of the Mast Kalandar outlets, near Whitefield.
The below pic is from the jungle theme restaurantat Hotel Pai Vista in Mysore.