An international mobile subscriber identity (IMSI) catcher or cell-site simulator (CSS) is a telephone eavesdropping device used for intercepting mobile phone traffic and tracking location data of mobile phone users. Essentially a "fake" mobile tower acting between the target mobile phone and the service provider's real towers, it is considered a man-in-the-middle (MITM) attack.
An international mobile subscriber identity (IMSI) catcher or cell-site simulator (CSS) is a telephone eavesdropping device used for intercepting mobile phone traffic and tracking location data of mobile phone users. Essentially a "fake" mobile tower acting between the target mobile phone and the service provider's real towers, it is considered a man-in-the-middle (MITM) attack.
Source: Wikipedia "IMSI-catcher" · CC BY-SA 4.0
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