....registration - it's permanent, unless you move/change phone numbers!
http://www.consumer.ftc.gov/articles/0108-national-do-not-call-registry
How long does my phone number stay registered?
Telephone numbers on the Registry don’t expire. We only remove your number when it’s disconnected and reassigned, unless you ask us to remove it.
I moved and got a new phone number. Do I need to register the new number?
Yes.
Do I need to take my old phone number off the list when I get a new number?
No. The system removes numbers automatically when they are disconnected and reassigned.
What happens if my phone number is disconnected and then reconnected?
If your number is disconnected and then reconnected, you might need to re-register. You also might need to re-register if you change calling plans or change the billing name on your account. To verify that your number is in the Registry, go to www.donotcall.gov or call 1-888-382-1222.
If my area code changes or splits, do I need to re-register?
If the phone companies change your three-digit area code, you don’t have to re-register. Your new number will be registered for you during the 90-day period when both the old and new area codes work.
Where can I get more information?
If you have questions or complaints regarding the Do Not Call Registry, please contact the FTC by email at
[email protected].