Abstract: Systems and techniques are provided for managing and categorizing undesired phone calls and text messages. In a specific implementation, information indicating that an electronic communication received at a mobile communications device of each user in the crowd should belong in a specific category is received from a crowd. If a number of users in the crowd exceeds a threshold value, information identifying the electronic communication is stored in a database as belonging in the specific category. The database is provided to a mobile communications device of a user, where when the electronic communication is transmitted to the mobile communications device of the user, the electronic communication is blocked at the mobile communications device of the user because the electronic communication is in the specific category.

Abstract: A security application program provides features to help users recover their stolen mobile communication devices. The security application program may be pre-loaded into a system partition of the mobile device so that the security application program will not be erased during a wipe or factory reset of the mobile device. An owner registration service may be provided to help verify ownership of the mobile device.

Abstract: Systems and techniques are provided for managing and categorizing undesired phone calls and text messages. In a specific implementation, an electronic communication identified by a phone number is intercepted at a mobile communications device before the electronic communication is received by an application program on the device. The phone number is sent to a server for the server to identify a category associated with the phone number. The category is received at the mobile communication device. Based on the received category, a determination is made as to whether the application program should be allowed to receive the electronic communication. If allowed, the electronic communication is forwarded to the application program; else, the electronic communication is not forwarded.

Abstract: Systems and techniques are provided for managing and categorizing undesired phone calls and text messages. In a specific implementation, information indicating that an electronic communication received at a mobile communications device of each user in the crowd should belong in a specific category is received from a crowd. If a number of users in the crowd exceeds a threshold value, information identifying the electronic communication is stored in a database as belonging in the specific category. The database is provided to a mobile communications device of a user, where when the electronic communication is transmitted to the mobile communications device of the user, the electronic communication is blocked at the mobile communications device of the user because the electronic communication is in the specific category.

Abstract: Systems and techniques are provided for managing and categorizing undesired phone calls and text messages. In a specific implementation, an electronic communication identified by a phone number is intercepted at a mobile communications device before the electronic communication is received by an application program on the device. The phone number is sent to a server for the server to identify a category associated with the phone number. The category is received at the mobile communication device. Based on the received category, a determination is made as to whether the application program should be allowed to receive the electronic communication. If allowed, the electronic communication is forwarded to the application program; else, the electronic communication is not forwarded.