What does SMS notification mean? What did they say when they called again? Did they open something or was I blacklisted by him?

It didn't make you unconscious. If you make a phone call, you will hear a beep, but the other party doesn't know you called and you can't get through to him. If you hear "you will inform the other party by SMS or something", the other party will adjust the flight mode, but he will not receive the network because he is in a place with poor signal.