3G shutdown in Switzerland: Is my Stromer affected by the shutdown of 3G technology (Swisscom)?

This depends on the installed OMNI Interface C. Only Stromer models ST1, ST1 X, ST2, ST2 S, ST3, and ST5 produced up to the end of 2021 are affected. 
You can check on your OMNI Interface C under “Menu/System/About” to see if your Stromer is affected: 
In the SUI list, check the settings “CON” and “SN”: 

• If the entry under “CON” starts with RHL85xx… or 
• If the entry under “SN” begins with the digits 401023 or 403470, 

then your OMNI C interface is not compatible with 4G, and you will no longer have mobile network connectivity once 3G technology is shut down.