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eCall relies on SMS messages and it can only connect to the emergency cellular network.

• mschuster91 4y ago
  Do we know what the modem attached to the ECU is actually capable of doing, and what it is being used for? These things get barely audited, it took years to reverse engineer the stuff in "dieselgate". And that, in any case, completely ignores all the car models that offer functionalities like Bluetooth SAP [1] where the car has its own modem that the phone forwards its credentials to - which a really high amount of cars has had for well over a decade now [1], or cars where the infotainment system has capabilities like Internet access on their own, capabilities on which eCall can piggyback. [1] https://de.wikipedia.org/wiki/SIM-Access-Profile https://de.wikipedia.org/wiki/SIM-Access-Profile