BlockUs automatically blocks all SMS/MMS/E-Mail and maintains a database of all outgoing messages on a mobile device. This tool acts as a background sentinel blocking the transmission of unauthorized messages. Once a message is sent either by the devices' user or some program executing on the device the message is blocked (unless the recipient list of the message has been authorized by the user). Blocked messages are moved from the OutBox to a special blocked Folder. By specifying an un-block rule (based on the recipient list of the original blocked message), the user releases the blocked and all future messages. BlockUs also supports partial un-block rules via wild-card characters.