The invention provides a mobile device prompting system, a management system and an object management method. A mobile device management system includes a mobile device, a locator unit, and an operation unit. The locator unit includes a transmitter and is disposed on or in the mobile device. The operation unit is configured to receive the wireless signal. The units are configured to determine a distance between the locator unit and the operation unit and to cause a notification device to perform a notification when the distance is greater than a threshold signal strength value. The mobile device can also be configured to send a wireless signal to the locator unit when the mobile device receives a call or a message. The operation unit can be used to control the mobile device. A method usingthe system can help a person remember to retrieve the mobile device, to know to pick up a phone call, or to control a mobile device remotely.