The mobile phone is on the table. What forces act on the phone; what is the weight of the phone applied to?

The mobile phone is influenced by the force of gravity from the earth, as well as the reaction force of the support from the side of the table. These two forces are equal in magnitude and opposite in direction. Weight is always the force with which a body acts on a support or suspension. In this case, the weight of the phone is applied to the table surface.