Also, there are some phones that you can see diagnostics from the baseband: https://github.com/2b-as/xgoldmon https://github.com/2b-as/xgoldmon "xgoldmon is a

Also, there are some phones that you can see diagnostics from the baseband: https://github.com/2b-as/xgoldmon https://github.com/2b-as/xgoldmon "xgoldmon is a small tool to convert the messages output by the USB logging mode of phones with Intel/Infineon XGold baseband processor back to the GSM/UMTS radio messages sent over the air so you can watch them in e.g. Wireshark in realtime." The idea here being that if you can see diag from these phones you can watch for suspicious things like zero length SMS and so on ...