To block or reduce spam calls on your iPhone, use a mix of built‑in settings, carrier tools, and (optionally) apps.

Silence unknown and spam callers

These options stop most spam from actually ringing your phone.

1. Silence Unknown Callers (built‑in)

This is the simplest “set it and forget it” option.

  1. Open Settings → Phone.
  1. Tap Silence Unknown Callers.
  1. Turn it On.

What it does:

  • Calls from numbers not in Contacts, recent outgoing calls, or Siri suggestions go straight to voicemail and only show in Recents , without ringing.
  • Great if most of your important calls are already saved as contacts.

Watch out:

  • You might miss legitimate first‑time callers (doctor’s office, delivery, interview calls), so add important numbers to Contacts when you can.

2. Silence/Screen “junk” callers (carrier‑tagged spam)

If your carrier supports it, iOS can auto‑silence numbers it detects as spam.

  1. Go to Settings → Phone → Call Blocking & Identification.
  1. Turn on Silence Junk Callers (if shown).

What it does:

  • Calls flagged as spam/fraud by your carrier get silenced and sent to voicemail, similar to Silence Unknown Callers but based on spam detection.

Block specific spam numbers

This is useful for repeat offenders but less effective against constantly changing numbers.

  1. Open the Phone app → Recents.
  1. Find the spam call, tap the i next to it.
  1. Scroll down, tap Block this Caller → Block Contact.

To manage blocked numbers:

  1. Go to Settings → Phone → Blocked Contacts.
  1. See the list, tap Edit to remove, or Add New… to block someone from Contacts.

Note: spammers often “spoof” new numbers, so don’t rely only on manual blocking.

Use Focus / Do Not Disturb for strict peace

If you want near‑total quiet during work, sleep, or family time, Focus is powerful.

  1. Open Settings → Focus and pick a mode (e.g., Do Not Disturb , Personal , Work) or create one.
  1. Tap People → Allow Calls From → Contacts Only (or Favourites).
  1. Turn that Focus on from Control Center when you don’t want unknown calls at all.

This blocks calls from everyone not allowed in that Focus while it’s active, even if they’re not spam.

Turn on carrier spam protection

Most US carriers now bundle spam protection that labels or blocks “Scam Likely” calls.

Check inside iOS

  1. Go to Settings → Phone → Call Blocking & Identification.
  1. If you see options like T‑Mobile Scam Shield , Verizon Call Filter , or similar, make sure they’re enabled.

These services can:

  • Tag calls as Scam Likely/Spam on your screen.
  • Sometimes auto‑block or send them to voicemail, depending on your carrier plan.

Your carrier may also offer an app with more controls (whitelists, stricter blocking, logs).

Use third‑party spam‑blocking apps (optional)

If you’re still getting hammered with spam, apps can add extra filtering.

Common options mentioned in recent guides include:

  • Hiya
  • Truecaller
  • RoboKiller
  • Nomorobo

How to hook them into iOS:

  1. Download the app from the App Store and complete its setup.
  1. Go to Settings → Phone → Call Blocking & Identification.
  1. Turn on the switch for that app so it can identify/block calls.

These apps use big spam databases to identify known robocallers and telemarketers in real time.

Keep your iPhone updated

New iOS versions often tweak call screening and spam controls.

  1. Go to Settings → General → Software Update.
  1. Install any available updates so you get the latest call‑protection features.

Example “best‑effort” setup

If you want a practical combo that works well in 2026 for most people:

  • Turn on Silence Unknown Callers if almost all important callers are in your Contacts.
  • Enable your carrier’s spam protection and Silence Junk Callers if available.
  • Use Focus → Allow Calls From → Contacts Only during meetings/sleep.
  • Add a trusted app like Truecaller or RoboKiller if spam is still heavy.
  • Manually block repeat offenders from Recents when you notice them.

Information gathered from public forums or data available on the internet and portrayed here.