6abc:

If your wireless carrier isn’t making money off the phone number
you’re calling it might just lock that number out of your system.
AT&T Cingular has started blocking certain phone numbers that the
company says are costing it millions of dollars in losses and consumer
advocates say this is already creating a ripple effect.

Mary Lou Perry has been using a free conference call service to
talk to her Mary Kay Cosmetics colleagues everyday. But six days ago,
her wireless provider, Cingular, started blocking her from dialing into
the conference call in number.

"I’m absolutely outraged, that they can ban specific numbers from our lines," Perry said.