For the past week or so, I've been getting many long distance phone calls to my house where there's noone on the other side. It has the distinct long distance ring. I pick up, say hi, and there's noone there. I wait 5-10 seconds, still noone. This happens ~2-5 times a day and has been happening on and off for the past week. I don't have call display, so I have no idea who is doing this. Its bugging the hell out of me, especially since its exam time!