How to block spam calls on iphone?

To block spam calls on an iPhone, open Settings, select Phone, tap Silence Unknown Callers, and toggle the switch to On to automatically mute unsaved numbers.3 Ways to Block Spam Calls on iPhone1.Silence Unknown Callers:Method 1 (Built-In Feature).Open Settings, tap Phone (or Apps > Phone on iOS 18+), select Silence Unknown Callers, and toggle the switch On. Calls from numbers not in your Contacts, recent outgoing calls, or Siri Suggestions will be sent directly to voicemail.2.Enable Call Blocking & Identification:Method 2 (Carrier & Apps).Download a carrier spam app (like AT&T ActiveArmor, Verizon Call Filter, or T-Mobile Scam Shield) or a third-party app (like Truecaller). Go to Settings > Phone > Call Blocking & Identification and toggle the app On.3.Block Specific Repeat Spam Numbers:Method 3 (Manual Block).Open the Phone app, go to the Recents tab, tap the info (i) icon next to the unknown spam number, scroll down to the bottom, and tap Block this Caller.Comparison of Spam Blocking MethodsBlocking MethodSilences Unsaved Numbers?Sends Calls to Voicemail?Allows Known Emergency Contacts?Silence Unknown CallersYes (All unlisted callers)YesYes (Contacts, recent calls, & Siri)Carrier Spam FilteringYes (Identified spam only)Depends on carrier settingsYesManual Number BlockYes (Selected numbers only)No (Blocks call completely)YesWhat Happens When Silence Unknown Callers Is Enabled?Ringer Disabled: Unsaved phone numbers will not ring your phone or trigger vibrations.Sent to Voicemail: The caller is immediately routed to your voicemail to leave a message.Logged in Recents: The phone number will still appear in your Recents tab list so you can review missed calls.Emergency Override: If you place an emergency call, Silence Unknown Callers is temporarily disabled for 24 hours to ensure callback availability.