someone got my phone number but refused to tell me how they did it

A while ago a random guy sent me a message. He used to go to the same school as me when we were teens. He said he saw me around town and "found a way" to get my phone number, but refused to tell me how, saying that "one day" he'd tell me. I blocked him because honestly what he did was just creepy. But now i'm wondering, how could he possibly have done that? I've changed my number a …

found go to message phone phone number privacy random school teens