Open Settings
Tap Phone
Turn on Silence Unknown Callers
Use Do Not Disturb or Focus mode
Allow calls only from contacts in Focus settings
Block specific numbers in Recents
Contact your carrier for call blocking services
Use a trusted call-blocking app from the App Store
Enable carrier spam protection if available
Turn on Live Voicemail if supported
Ask your carrier to block anonymous calls
Reset network settings if call blocking is not working
Update iPhone to the latest iOS version