National Do Not Call List
Check to see if your number is on the list
If you are tired of getting spam calls, one thing to do is to check if your phone number is on the "Do Not Call Registry." The FCC has set up a service where you can check your number.
What about Cellphone?
According to the FCC, "it is not necessary to register cell phone numbers on the National Do Not Call (DNC) Registry to be protected from most telemarketing calls to cell phones."
If you have a landline, you should register your number - unless you like being interrupted.
Telephone Consumer Protection Act
Consumers in the United States have protection through the Telephone Consumer Protection Act of 1991.
One More Thing...
The Do Not Call Registry doesn't apply to call centers outside of the United States. They are under no obligation to follow the rules set by the FCC.
This means, as a consumer, you are not obligated to be truthful in answering these calls. :)