Category Archives: 2g

36C3: SIM Card Technology From A to Z

SIM cards are all around us, and with the continuing growth of the Internet of Things, spawning technologies like NB-IoT, this might as well be very literal soon. But what do we really know about them, their internal structure, and their communication protocols? And by extension, their security? To shine …read more

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Posted in 2g, 36C3, 3g, 4g, 5g, Cellphone Hacks, cellular network, cons, eSIM, gsm, sim card, technology | Leave a comment

New Part Day: The $15 ESP32 With Cellular

Cruise around AliExpress for long enough and you’ll find some interesting new hardware. The latest is the TTGO T-Call, an ESP32 breakout board that also has a cellular modem. Yes, it’s only a 2G modem, but that still works in a lot of places, and the whole thing is $15. …read more

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Posted in 2g, ESP32, Microcontrollers, SIM800, SIM800L, wireless hacks | Leave a comment