Well, actually you cannot know for sure. If the person trying to call you has only your phone number as a mean to contact you, you cannot possibly know if their

Well, actually you cannot know for sure. If the person trying to call you has only your phone number as a mean to contact you, you cannot possibly know if their are trying or not to contact you. I understand you are assuming they are going to escalate somehow to get to you, but maybe it can't just be possible in some scenario.