A wireless communications device is controlled in accordance with motion thereof. If the device is determined to be in motion, such as in a vehicle, use of the device is restricted. Discrimination between vehicular motion and ambulatory motion is provided. While in motion, use of the device can be allowed under specific exception conditions. Exception conditions include the device being used by a passenger of a vehicle, a 911 call, or a call to a designated number. The ability to control the device in accordance with motion thereof can be remotely activated and deactivated, thus allowing, for example, parental control of a device belong to a child.