A mobile device includes a security device. The security device determines whether the mobile device is inside or outside security zones defined around a device being carried around by a user and an access point disposed at or near a place where the user regularly visit by detecting presence or absence of the wireless connection therewith. The device further determines whether or not there is an ongoing scheduled event and whether the mobile device is at or near an event location. The device further assesses a risk level of an environment where the mobile device is currently disposed based on determination results, and executes one of preset security action controls in response to the risk level determined to allow the mobile device to perform a security action to alert the user.