While the average user will likely never encounter it, the existence of these technologies has already changed the trust model of mobile phones. Journalists, activists, executives, and government officials must treat baseband firmware as a hostile environment – because in many cases, it is.
: The dedicated processor in a phone that runs the GSM firmware, often completely separate from the main OS (Android/iOS). e-PG Pathshala mathematical analysis of the encryption algorithms, or are you interested in how to flash custom firmware onto a device? Security Issues and Attacks on the GSM Standard: a Review gsm+secret+firmware
Stay vigilant. Stay air-gapped. And never trust the modem. While the average user will likely never encounter
Detection requires a "Side-Channel Analysis." Engineers use a spectrum analyzer to look for unexpected RF bursts, or they decap the chip (remove the epoxy casing) and use electron microscopes to read the microcode. And never trust the modem
