Individuals who list their phone numbers on the national do not call registry should stop receiving calls from most telemarketers within 31 days. However, some telemarketers are exempt, including charities seeking donations, politicians seeking votes, survey companies doing opinion polls and companies with which the individual does business.
If telemarketers violate the do not call list they may be subject to fines and other penalties from the Federal Communications Commission. Many states also have do not call registries that add a level of deterrence and potential fines. Violations should be reported to the administrating agency immediately.
Other options include electronic countermeasures, such as call blocking features on cellphones and call-screening machines for landlines.