Know when not to use the flash. I know I would have suggested to use flash sometimes.
Have a look around to judge ambient light. If you feel there is enough light falling on the subject, you can take a shot without the flash, if the environment is dull lit, it is better to place the subject right and use the flash on your mobile phone at a good angle.
In this case there was enough light, so I placed the two bowls of ice-cream next to each other and set a frame and took a shot.
Shot using iPhone.
Have a look at our Food Photography using mobile.