The latest versions of windows phone, iPhone, and android all let you block calls from within the phone.

genuine idiot

Call me repeatedly so I called back to see who it was (yep, I'm that bored.)  Some company that stays it's the "Nations Largest Savings PRogram" and how I've maybe won a $100 gift voucher to Walmart if I'll just press 1 to be connected to the Walmart Voucher Gods.  I get so many of these calls I'd never have to pay for anything at Walmart the rest of my life...if they were legitimate, which I highly doubt.  Otherwise, they'd leave a message and not a bunch of hang-ups.  Now blocked, but really how many telemarketer numbers can you block?

calls hangs up

Just another High paying job from the presidents stimulus package!