If it's bill collectors that call, tell them he/she went bankrupt and give them an atty's phone #. If it's boy/girl that calls, tell them he/she is now married and no longer available. That's what I've done! I know, I know, terrible to give out an attorney's # but by the time I started getting those calls, I'd notified everyone of my number and hated to do it again!
I started getting calls last year on my home # for a nursery (plants/flowers). I went to the nursery and told her and she had NO idea why people called my #. When I was checking out after buying plants she gave me her business card for future purchases.....yip - there was my #!!!! She was SOOOO embarrassed! :P