There are different depths to mindfulness. First you learn to interrupt distraction and habits enough to become present more often.
When you experience presence in its various nuances, you dip into your present thoughts, feelings, actions, and intentions, in more detail. You can ask yourself, are they working for you, or against you?
This article by Pema Chodron for Omega.org starts off with leaving your phone alone sometimes. Note whether you feel more present, less distracted, like her granddaughter did.
Then choose a conscious focus within the presence you've carved in your awareness...