If you haven’t done so already, you need to register your cell phone on the national “do not call” list.
You have until February 1st before your number is released and you are fair game for telemarketers. And they’ll eat up YOUR minutes by calling you. I registered my home phone shortly after the “do not call” program was started, and I had a dramatic decrease in the amount of phone spamming I got. So the program works.
If you haven’t registered your home phone number, make sure you do that, too.