If you use an iPhone, you already have powerful tools to block scam and spam calls — no apps required.
This guide shows exactly which iPhone settings to turn on and how to stop scam calls from interrupting your day.
For a full overview covering all phones, see our main guide:
How to Block Spam Calls (Step-by-Step Guide).
Table of Contents
- The most important iPhone setting to turn on
- How to block a specific number on iPhone
- Use voicemail to screen calls safely
- Carrier tools that help block scam calls
- Common mistakes to avoid
- FAQs
Turn on Silence Unknown Callers (most important)
This is the single most effective setting on iPhone for stopping scam calls.
When enabled, calls from unknown numbers go straight to voicemail.
How to enable Silence Unknown Callers
- Open Settings
- Tap Phone
- Tap Silence Unknown Callers
- Turn the switch ON
Your contacts, recent outgoing calls, and Siri Suggestions will still ring through.
Scammers usually won’t.
How to block a specific number on iPhone
If the same number keeps calling, block it manually.
- Open the Phone app
- Tap Recents
- Tap the (i) icon next to the number
- Scroll down and tap Block this Caller
- Confirm by tapping Block Contact
Blocked callers cannot call, text, or FaceTime you.
Use voicemail to screen calls safely
Let unknown calls go to voicemail.
Legitimate callers — doctors, pharmacies, delivery services — will leave a message.
Safe voicemail greeting:
“Please leave a message after the tone.”
Avoid including your name, phone number, or travel plans in your greeting.
Carrier tools that help block scam calls
Most carriers offer free scam protection that works with your iPhone settings.
- Verizon: Call Filter (free)
- AT&T: ActiveArmor (free on most plans)
- T-Mobile: Scam Shield (free)
You can enable these through your carrier’s app or by calling customer support.
Common mistakes to avoid
- Answering calls just to “see who it is”
- Pressing buttons during robocalls
- Saying “yes” to unknown callers
- Calling back missed calls from unfamiliar numbers
If a call feels wrong, hang up. You don’t owe anyone an explanation.
FAQs
Will Silence Unknown Callers block important calls?
Unknown callers can still leave a voicemail, so you won’t miss important information.
Do I need a call-blocking app on iPhone?
Most people don’t. Built-in iPhone settings and carrier tools are usually enough.
Why do scam calls look local?
Scammers use number spoofing to make calls appear local so people are more likely to answer.
For Android users, see:
How to Block Scam Calls on Android.
