Abstract: In one embodiment, a method includes sending a request to a computing server from a mobile-client system for a multimedia object. The mobile-client system receives, from the computing server, a query in response to the request for SIM-card information of the mobile-client system. The mobile-client system executes an application in response to the query to access a SIM card of the mobile-client system and retrieve SIM-card information. The mobile-client system sends the retrieved SIM-card information to the computing server. The mobile-client system receives a multimedia object from the computing server, the multimedia object being customized based on the retrieved SIM-card information.

Abstract: In one embodiment, a method includes sending a request to a computing server from a mobile-client system for a multimedia object. The mobile-client system receives, from the computing server, a query in response to the request for SIM-card information of the mobile-client system. The mobile-client system executes an application in response to the query to access a SIM card of the mobile-client system and retrieve SIM-card information. The mobile-client system sends the retrieved SIM-card information to the computing server. The mobile-client system receives a multimedia object from the computing server, the multimedia object being customized based on the retrieved SIM-card information.

Abstract: In one embodiment, a method includes receiving a request for a multimedia object from a mobile-client system of a first user, wherein the request comprises http-header information of the mobile-client system, determining one or more attributes of the mobile-client system based at least on a social-graph information associated with the first user and the http-header information, wherein determining the one or more attributes comprises calculating a probability score the mobile-client system has the one or more attributes by comparing the social-graph information associated with the first user and the http-header information with a database of a social-networking system, and sending the multimedia object to the mobile-client system in response to the request, the multimedia object being customized based on at least the determined one or more attributes of the mobile-client system.

Abstract: In one embodiment, a method includes receiving a request for a multimedia object from a mobile-client system of a first user, wherein the request comprises http-header information of the mobile-client system, determining one or more attributes of the mobile-client system based at least on a social-graph information associated with the first user and the http-header information, wherein determining the one or more attributes comprises calculating a probability score the mobile-client system has the one or more attributes by comparing the social-graph information associated with the first user and the http-header information with a database of a social-networking system, and sending the multimedia object to the mobile-client system in response to the request, the multimedia object being customized based on at least the determined one or more attributes of the mobile-client system.

Abstract: In one embodiment, a method includes receiving a request for a content object from a mobile-client system of a user, accessing SIM-card information associated with the mobile-client system the user, determining a carrier based at least on the SIM-card information, and sending the webpage to the mobile-client system in response to the request, where the content object has been customized based on the determined carrier of the mobile-client system.

Abstract: In one embodiment, a method includes receiving a request for a content object from a mobile-client system of a user, accessing SIM-card information associated with the mobile-client system the user, determining a carrier based at least on the SIM-card information, and sending the webpage to the mobile-client system in response to the request, where the content object has been customized based on the determined carrier of the mobile-client system.