HipDial is the easiest conference calling service. Both for you and for the participants. There's no PIN codes, no reservations, no setup and no software. Just a normal phone number. Dial the number and you’re in.
Every user gets their own dedicated phone number to use for their conference calls. When participants call that number, the owner gets a text message saying "X people are waiting in your conference line" while the participants listen to hold music. As soon as the owner dials into the conference, the call starts.