Draw a free body diagram when the phone is oriented vertically. IMPORTANT: where the arrows’ tail starts now matters! There are two forces acting on the phone in the vertical orientation and the forces are applied in two different places: The arrow representing the force of gravity should start where the center of mass of the phone is. The arrow representing the force of your hand pinching the phone should start where your thumb is.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!