Mobile Location: Are GSM IMSI Catchers and Companies Like PKI Still Relevant? IMSI catchers may soon face a triple threat: programmable SIM cards, multi-IMSIs and — thanks GET THE REST OF THE STORY – JOIN TODAY C5is is the only journal dedicated exclusively to the electronic surveillance needs of law enforcement, intelligence agencies and the military. Read objective reviews that help ensure informed decisions on your purchase of surveillance products and services. Stay on top of important news developments that rarely appear in mainstream media. Click below for membership. Subscribe or log in to access this content.