Reddit, What do you do with the numbers you find in public places?

One time in 5th Grade, I went to Astro-Camp for spring break as a school thing. Me and 4 friends shared a dorm that had some graffiti on the walls like "X+Y love forever!" We were then putting our baggage under our beds when my friend found writing in Sharpie under his bed. One of the notes said "Call # for a good time, say Vincent sent you. My friend had smuggled in his phone and being the little shits we were we decided to call the number. As soon as we said Vincent had sent us the caller turned out to be his ex-girlfriend. She then started to cuss and shout at saying "HANG UP, HANG UP!" After that we hung up and went to bed.