A system and method for using a wireless telephone in a vehicle in a hands-free mode. The wireless telephone and the vehicle have corresponding mating units. When a predetermined condition is satisfied while the mating units are not united, one of the wireless telephone and the vehicle is disabled. The predetermined condition can be one of several situations. For example, one condition may be that an attempt is being made to use the wireless telephone in the vehicle while the vehicle is moving. Another condition may be that an attempt is being made to move the vehicle while the wireless telephone is being used in a wireless communication session within the vehicle. When the mating units are united, the vehicle functions normally and the wireless telephone operates in a hands-free mode.