When someone you haven't spoken to for probably twenty years phones you up: "Hi Pete, remember me? I've got some work you might be interested in quoting for." I'm ALWAYS interested in quoting for work.
Our phone number must be on a list doing the rounds in India. We keep getting different people calling asking to speak to one of our customers whose website we, in fact, host, so it kinda shoots them in the foot when they ask: "Can I speak to Mr Mark S.... please?" straight away we know who they are.