I blame Comcast for all of these calls...when I signed up for their cable, I had to give them my cell phone number cause I was moving. During my phone call to Comcast they tried to sell me a million offers like ADT security system (like Bucky said above) and various other things. I rejected all of these "offers" and now I'm getting tons of unsolicited calls on my cell phone. Makes me hate Comcast even more for giving my cell phone number out.