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To make blocklisting effective, the IMEI number is supposed to be difficult to change. 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 ...
If the phone needs to be unlocked within the first six months, the carrier can charge DKK 500 (~ €67) [29] for the unlock. After six months, the carrier is obliged by law to unlock the phone free of charge. But the consumer needs to contact the original supplier, and provide the IMEI and original phone number for which the phone was sold.
A virtual base transceiver station (VBTS) [5] is a device for identifying the temporary mobile subscriber identity (TMSI), international mobile subscriber identity (IMSI) of a nearby GSM mobile phone and intercepting its calls, some are even advanced enough to detect the international mobile equipment identity (IMEI).
The Baltimore Police Department began using the devices in 2007. [2] The New York City Police Department has used the devices since 2008. [3] Initially, the use of stingray phone trackers was a secret, due to a number of non-disclosure agreements between individual police departments and the Federal Bureau of Investigation. [4]
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