Abstract: A system, apparatus, and method is directed towards managing a quick registration of a mobile device over a network. The quick registration is directed at enabling an end-user to conveniently register a mobile device to be useable for such communications sessions, as an instant messaging (IM) session, and the like. The invention employs a pre-determined extension to a short code that instructs a server to register the mobile device sending the message. The message includes an account identifier along with a password to the account. The message may be a single message line, thereby providing a quick and convenient mechanism for registering the mobile device. The server receives the message along with a mobile device identifier, and stores a mapping relationship between the account identifier and the mobile device identifier after validating the password. In one embodiment, the message includes a command that the mobile device also be logged into an IM session.

Abstract: Enabling a user of a device, such as a wired or wireless device, that is associated with a telephone number to communicate text messages with another user of another device that is not associated with a telephone number (or the telephone number is unknown to the sender). Although the other user's telephone number is not known or does not exist, the other user is associated with a user identifier for a user community that is assigned a Common Short Code (CSC). The text message includes a source telephone number (sender/user's device telephone number) and a destination number (the CSC for the other user/recipient's user community). The content of the text message includes a user identifier, where the identifier indicates the particular other user within the user community. A server employs the CSC to determine the user community and the identifier to determine the particular user in the determined community that is the intended recipient of the text message.