Mobile device 1402 can include memory 1420. Memory 1420 can include non-removable memory 1422 and/or removable memory 1424. Non-removable memory 1422 can include RAM, ROM, flash memory, a hard disk, or other well-known memory devices or technologies. Removable memory 1424 can include flash memory or a Subscriber Identity Module (SIM) card, which is well known in GSM communication systems, or other well-known memory devices or technologies, such as “smart cards.” Memory 1420 can be used for storing data and/or code for running operating system 1412 and application programs 1414. Example data can include web pages, text, images, sound files, video data, or other data to be sent to and/or received from one or more network servers or other devices via one or more wired or wireless networks. Memory 1420 can be used to store a subscriber identifier, such as an International Mobile Subscriber Identity (IMSI), and an equipment identifier, such as an International Mobile Equipment Identifier (IMEI). Such identifiers can be transmitted to a network server to identify users and equipment.