Poster: <scp>SIMulator:</scp> SIM Tracing on a (Pico-)Budget

SIM tracing - the ability to inspect, modify, and relay communication between a SIM card and modem - has become a significant technique in cellular network research. It enables essential security- and development-related applications such as fuzzing communication interfaces, extracting session keys, monitoring hidden SIM activity (e.g., proactive SIM commands or over-the-air updates), and facilitating scalable, distributed measurement platforms through SIM reuse. Traditionally, achieving these capabilities has relied on specialized hardware, which can pose financial and logistical burdens for researchers, particularly those new to the field.