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However, a phone's IMEI may be easy to change with special tools. [11] [better source needed] In addition, IMEI is an un-authenticated mobile identifier (as opposed to IMSI, which is routinely authenticated by home and serving mobile networks.) Using a spoofed IMEI can thwart some efforts to track handsets, or target handsets for lawful intercept.
Phone hacking often involves unauthorized access to the voicemail of a mobile phone. The unauthorized remote access to voicemail systems, such as exposed by the News International phone hacking scandal, is possible because of weaknesses in the implementations of these systems by telephone companies.
The international mobile subscriber identity (IMSI; / ˈ ɪ m z iː /) is a number that uniquely identifies every user of a cellular network. [1] It is stored as a 64-bit field and is sent by the mobile device to the network.