Mobile device 1202 can include memory 1220. Memory 1220 can include non-removable memory 1222 and/or removable memory 1224. Non-removable memory 1222 can include RAM, ROM, flash memory, a hard disk, or other well-known memory devices or technologies. Removable memory 1224 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 1220 can be used for storing data and/or code for running operating system 1212 and application programs 1214. 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 1220 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.