Described is a smartphone lock box system that is used to track and record when and how long a mobile computing device is locked or secured in a container, such as a box (lock box), a sleeve or the like, without access by the owner of the mobile computing device. The smartphone lock box system is used to help the owner of a mobile computing device disconnect from the mobile computing device to devote time and attention to other tasks. The smartphone lock box system includes a container that holds at least one mobile computing devices such as a smartphone or tablet. The container senses when a mobile computing device is within it and records and reports the amount of time the mobile computing device is in the box and tracks the frequency that the user checks or removes the phone from the box.