https://github.com/CellularPrivacy/Android-IMSI-Catcher-Dete...
https://jon.oberheide.org/blog/2010/06/28/a-peek-inside-the-...
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Google Play Services spyware discussion
https://forum.xda-developers.com/t/guide-insanely-better-bat...
https://forum.xda-developers.com/t/app-disable-service-guide...
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"...the cellular carrier can send blobs of FORTH code right to the radio. The radio firmware also seems to have an IP stack (with TCP) so it can do its own interesting things (both bad and good)..." https://boston.conman.org/2013/01/22.2
"...easily spotted loads and loads of bugs, scattered all over the place, each and every one of which could lead to exploits – crashing the device, and even allowing the attacker to remotely execute code. Remember: all over the air. One of the exploits he found required nothing more but a 73 byte message to get remote code execution. Over the air..."
"... It’s kind of a sobering thought that mobile communications, the cornerstone of the modern world in both developed and developing regions, pivots around software that is of dubious quality, poorly understood, entirely proprietary, and wholly insecure by design." https://www.osnews.com/story/27416/the-second-operating-syst... (archive: https://archive.is/FOR5V)
https://news.ycombinator.com/item?id=6722539
https://news.ycombinator.com/item?id=6722732
https://news.ycombinator.com/item?id=6722648
https://news.ycombinator.com/item?id=6738066
https://news.ycombinator.com/item?id=6724034 <-- Seems to be higher risk with Qualcomm basebands where everything is integrated
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SIM card reader chips have their own operating system https://en.wikipedia.org/wiki/SIM_card#Design
Rooting SIM cards https://archive.is/3ZohQ
https://news.ycombinator.com/item?id=6722896
https://news.ycombinator.com/item?id=6724215
https://news.ycombinator.com/item?id=6723236
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https://github.com/CellularPrivacy/Android-IMSI-Catcher-Dete...
https://github.com/CellularPrivacy/Android-IMSI-Catcher-Dete...
[0] https://cellularprivacy.github.io/Android-IMSI-Catcher-Detec...
[1] https://github.com/CellularPrivacy/Android-IMSI-Catcher-Dete...
https://github.com/CellularPrivacy/Android-IMSI-Catcher-Dete...
There is also an open-source android app to detect fake base-stations: https://github.com/CellularPrivacy/Android-IMSI-Catcher-Dete...