If it's a cell phone you can hack into their cell phone and change their voice message to something bad. LOL! They call me harassing me and if I am able to get into their voice mails I change them talking crap about them so when people call they hear it. It may not teach them a lesson but it sure as hell pisses them off and they end of changing the number and have to start all over. I say if they are going to mess with us and bother us, we should do it back and make life miserable for them as well. This one I am having a harder time getting into the voice mail though. Just saying....