Key legal question
Whether using a mobile phone with another person's SIM card constitutes fraudulent misuse of a data processing system under Art. 147 StGB.
Extracted holding
Yes. Mobile telephony involves data processing through the carrier's computers; using another person's SIM card to place calls unbefugt causes an incorrect billing result and a pecuniary shift.
Extracted reasoning
The carrier's computers process call data, generate automated billing, and the unauthorized calls trigger charges to the legitimate subscriber. The conduct fits the unbefugte Verwendung von Daten variant and produces an incorrect data-processing result.