Authoritative sources

Independent primary sources used to check and corroborate the guidance on this page.

• 
  US Federal Communications Commission — Robocalls

  Regulator guidance on blocking unwanted calls and texts.

• 
  US National Do Not Call Registry

  Register a number and file telemarketing complaints.

• 
  UK Ofcom — Nuisance Calls and Messages

  UK regulator advice and reporting routes for scam calls and SMS.