Here, since it is dealing with cellular telephones, I would think it applies to the position and movement of the individual phones from cell to cell.

See the link under "Cell" where it states:

... By controlling the transmission power and the radio frequencies assigned from one cell to another, a computer at the Mobile Telephone Switching Office (MTSO) monitors the movement and transfers the phone call to another cell and another radio frequency as needed.

My thought from the USA.