In recent years, the volume of automated telemarketing calls and sophisticated phone scams has skyrocketed. If you find your iPhone constantly buzzing with calls from numbers you do not recognise, it can become incredibly disruptive to your daily life. Fortunately, Apple has integrated a powerful set of tools directly into iOS designed specifically to combat this modern nuisance. Learning how to block spam calls on your iPhone is a vital step in reclaiming your digital peace of mind.
In this security guide, we will demonstrate how to easily block individual nuisance numbers, and more importantly, how to use the aggressive “Silence Unknown Callers” feature safely without accidentally missing crucial calls from your doctor or a delivery driver.
How to Block an Individual Phone Number
If you keep receiving repeated calls from the same annoying telemarketer or scammer, the simplest solution is to block that specific number permanently. Once blocked, the caller will be sent straight to your voicemail without your phone ever ringing.
- Open the Phone app on your iPhone.
- Tap on the Recents tab at the bottom of the screen to view your call history.
- Locate the spam number you wish to block. Do not tap the number itself, as this will call them back.
- Tap the small blue “i” (Information) icon on the far right side of the screen next to the number.
- Scroll to the very bottom of the contact card.
- Tap Block this Caller.
- A confirmation menu will appear; tap Block Contact.
You will no longer receive phone calls, FaceTime requests, or text messages from this specific number.
How to Silence All Unknown Callers
Blocking individual numbers is helpful, but scammers frequently “spoof” their numbers, meaning they call you from a different fake number every single time. To combat this, Apple introduced a blanket filter called Silence Unknown Callers.
When this feature is enabled, any call from a number that is not saved in your Contacts app, your recent outgoing calls, or Siri Suggestions (numbers found in your emails or text messages) will be automatically silenced and sent to voicemail.
- Open the Settings app on your iPhone.
- Scroll down and tap on Phone.
- Scroll down to the “Call Silencing and Blocked Contacts” section and tap Silence Unknown Callers.
- Toggle the switch to the green On position.
The Dangers of Silencing Unknown Callers
While this feature is incredibly effective at stopping spam, you must use it cautiously. If you are expecting a call from a hospital, a job interviewer, or an Amazon delivery driver, their numbers will almost certainly not be in your Contacts app. If Silence Unknown Callers is turned on, you will miss these important calls.
Pro Tip: If you need to make an emergency call (e.g., dialling 999 or 911), your iPhone will automatically disable the Silence Unknown Callers feature for the next 24 hours to ensure emergency responders can reach you.
Frequently Asked Questions
Do third-party spam blocking apps actually work?
Yes. If you cannot use the native Silence Unknown Callers feature because you expect important calls from unsaved numbers, you can download reputable third-party apps like Truecaller or RoboKiller from the App Store. These apps maintain vast databases of known scammers and integrate directly with your iPhone’s Phone app to identify and block spam dynamically.
By understanding and utilising these built-in iOS tools, you can significantly reduce the amount of daily spam you receive and ensure your phone only rings when it truly matters.
