"Don't think too much. We definitely didn't monitor you. We can indeed locate your phone, but unless something special happens, we will never take the initiative to do that.
Not to mention that you didn't join South Heaven. Even members of South Heaven have their own privacy. We definitely won't invade our privacy.
The reason why we knew you came to Dilsburg City was that you had just passed by the headquarters of South Heaven. Any member of South Heaven within a certain distance from the headquarters would be shown on the instrument.
Although you are not a member of South Heaven, your cell phone is from South Heaven. It will also be displayed in the instrument. If you dislike it, I can get someone to erase your cell phone signal on the instrument."
Yohannes's explanation was rather detailed. It was obvious that he did not wish for any estrangement to arise in Michael's heart.