Contemporary SIM profiles track rapid, abnormal authentication requests. If a modern card detects thousands of consecutive failed authentications (a symptom of scanning software), it permanently fries its own internal silicon to protect the customer's encryption keys.

: The tool was famously used to attempt the extraction of the KI (Authentication Key) and IMSI (International Mobile Subscriber Identity) from older GSM SIM cards.

is a legacy, specialized SIM card data recovery and GSM forensic software tool primarily used by security researchers, mobile enthusiasts, and telecom engineers to read, analyze, and clone older generations of Subscriber Identity Module (SIM) cards.