biggest shock about StingRay
is that some US police forces have paid over $100K for the imsi-catcher, whilst in a lab we were able to get a repurposed eBay USB-TV RTL-SDR receiver ($10) running FLOS to do a quite similar job.
remember that USA is switching OFF 2G in Washington area soon. . . that's a reasonable security response to the ease & low cost for 2G intercept nowadays, and a hint to the ongoing threats
of course, this endemic security threat to GSM only exists in North America?