I assume your car has mbrace and that it has a red SOS button along with the Road side Assistance call button and the MB Info call button. They all work using the car's own "internet" connection to access those services. You don't have to have a cellphone in order for those services to work. This is part of why you pay for the service. The Mercedes Apps connect to the internet the same way by using its own connection which you pay for, not through your cellphone's connection.
Black CLA250 - Premium, Multimedia, Sport, Panorama roof, Bi-Xenon, Window Tinting (50%/35% Front/Rear), Carlsson C-Tronic.
Bridgestone Blizzak LM-60 RFT (Run Flats) mounted on 18x8 Anzio Turn Bright Silver wheels with TPMS sensors for winter driving.