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The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices.. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network.
However, a phone's IMEI may be easy to change with special tools. [10] [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.
Other administrators working under GSMA may also allocate any IMEI for use in dual-technology phones. For instance, Apple and LG normally use RR=35 which is allocated by BABT while Chinese brands such as Huawei use two RR=86 IMEIs allocated by TAF for 3GPP networks alongside a distinct RR=99 decimal or RR=A0 hexadecimal MEID for 3GPP2 networks.
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.
[11] Body-worn IMSI-catchers that target nearby mobile phones are being advertised to law enforcement agencies in the US. [12] The GSM specification requires the handset to authenticate to the network, but does not require the network to authenticate to the handset. This well-known security hole is exploited by an IMSI catcher. [13]
She was one of 11 special needs students who were turned away from dine-in service at the Cracker Barrel restaurant in Waldorf, Maryland during a field trip on Dec. 3, parents and school officials ...
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