Volvo On Call at used car (?)

Hello dear Volvo-Forengemeinde, I have been the owner of a used XC60 (MJ2016) since yesterday. Now I am dealing with my first Volvo intesiv and I discovered this “On Call” or “SOS” button in the sky. A pressure on the “On Call” button caused only a short text fade “The button has to be pressed for more than 2 seconds”. Otherwise nothing happened. Which also seemed logical to me, because I did not conclude an on-call contract with Volvo be. In the “MyCar” menu the entry “Enter Open-PIN” was added in the on-call submenu. As far as all clear and understandable. Today I dared to press this SOS button. I didn’t have a Volvo-On-Call contract anyway and my smartphone was not connected either. What should happen already I thought. I pressed the button longer and there was something on the display with connection. I didn’t think about it now. But suddenly it really rings! Of course, I stopped this immediately and wondered how it was possible without a smartphone and SIM card in the vehicle modem at all. A few minutes later it rang in the car quite shrill and a nice lady on the phone asks me if I need help. One was embarrassed. Of course, I politely apologized and explained the situation to her. She was also a little surprised that these buttons work, although I don’t have a Volvo-On-Call contract. It was then for a while a small SOS symbol is visible in the screen instead of the phone listener, but then disappeared a few minutes after the call. Since this action also the menu item “PIN input” in the on call submenu has disappeared. I don’t know why? And if I press the on call button now, there is no message at all. I don’t dare to press the SOS key anymore. Can someone please tell me about this on call? Why did the emergency call work? rhaupt? How is this technically possible? And where has this PIN input menu item disappeared? Questions about questions. Thank you in advance. LG, Roli