Spam calls have gotten aggressive enough that most phones now include tools specifically built to fight back.

Turn On Built-In Filtering

Both iPhone and Android let you silence calls from unknown numbers automatically, sending them straight to voicemail while still ringing for saved contacts. This single setting eliminates the vast majority of robocalls without any extra apps.

Add a Dedicated Call-Blocking App

Apps that maintain shared spam number databases catch calls before your phone even rings, and improve over time as more users report new numbers. Registering your number on the national Do Not Call list also reduces legitimate telemarketing calls, even if it does not stop scammers.

Combining both approaches gets close to eliminating unwanted calls entirely.