Feature is based on the same tech implementation as these SOS/Service call buttons almost every modern car has. It uses IoT sim. People who have SOS/Service call button in their cars are also falling under this issue except it would only affect cars that has been outside of russian cellular towers for over 72h. Also, maybe this is happening due to Porsche not willing to extend IoT sim subscriptions for russian citizens making their sims essentially to be disabled. But I am not sure how car manufacturer IoT sim contracts work. For a typical company/private person IoT sim contract is for 10 years with typically 1gb of data for the same timeframe. If car manufacturer contract is similar to that, this may be the reason why their cars are bricking.