Unfortunately, I don't know whether the alarm system can be operated with 4G SIM. There is no information in the operating instructions. I never put the system into operation and sold it again.

It no longer works with a 2G card from Swisscom. I have inserted a prepaid Sunrise card and the system is transmitting the alarms again. It is not clear how long Sunrise will continue to support the 2G network. There is talk of at least another 2 years