Block private calls by turning on a built-in setting or using your carrier's service

Most phones have a setting that rejects calls from numbers marked as private or unknown. On iPhones, this lives in Settings under Phone. On Android devices, it's usually in the Phone app's settings or under Call Blocking. If your phone doesn't have this option, your carrier — Verizon, AT&T, T-Mobile, or another provider — offers a separate service, sometimes free and sometimes for a monthly fee.

The exact steps depend on what device you have and which carrier you use. Some carriers let you manage blocking through their website or app instead of calling customer service. This guide walks you through the main routes so you can pick the one that fits your phone and situation.

Key Takeaways

  • iPhones have a built-in "Silence Unknown Callers" setting that sends private calls straight to voicemail without ringing.
  • Android phones usually have a call-blocking option in the Phone app settings, though the exact location varies by manufacturer.
  • If your phone doesn't have a built-in option, your carrier offers blocking services — some free, some paid — that you can set up online or by phone.
  • Blocking private calls means you may miss legitimate calls from hospitals, banks, or other organizations that hide their numbers for privacy reasons.

How to block private calls on an iPhone

iPhones have a feature called Silence Unknown Callers that automatically sends calls from private or unknown numbers to voicemail. Open Settings, tap Phone, then scroll down and toggle on "Silence Unknown Callers." Once it's on, any call from a number not in your contacts will ring silently and go straight to voicemail.

This is the simplest option for most iPhone users because it requires no monthly fee and no setup beyond flipping one switch. The downside is that legitimate callers — your doctor's office, your bank, a delivery driver — may also be blocked if they use private numbers. Check your voicemail regularly to catch important calls you might have missed.

How to block private calls on Android

Android phones vary by manufacturer, but most have a call-blocking option built into the Phone app. Open the Phone app, tap the three-dot menu (or settings icon), look for "Blocked numbers," "Call blocking," or "Do Not Disturb," and add "Unknown" or "Private" to the blocked list. Some phones call this "Block Unknown Callers" or "Block Calls from Unknown Numbers."

If you can't find this option in your Phone app, check your device manufacturer's settings. Samsung phones have it under Phone Settings > Call Rejection. Google Pixel phones have it under Phone > Settings > Spam and Call Screen. If your Android phone still doesn't show a blocking option, move to the carrier-based method below.

Using your carrier's call-blocking service

If your phone doesn't have a built-in blocking option, or if you want more control over what gets blocked, your carrier offers a service. Verizon's Call Filter, AT&T's Call Protect, and T-Mobile's Scam Shield all block private calls as part of their standard features. Some versions are free; others cost a few dollars per month.

To set up carrier blocking, visit your carrier's website and log into your account, or call customer service. You can usually turn on private call blocking without leaving your phone. The service works at the network level, so it blocks calls before they reach your phone — useful if your device doesn't have its own blocking option.

What happens when you block private calls

When private calls are blocked, the caller hears a message saying the call cannot be completed or the number is not accepting calls. They may be offered the option to leave a voicemail, or the call may straightforward disconnect. The call does not reach your phone, and you receive no notification that someone tried to call.

This means you won't know a private caller attempted to reach you unless they leave a message. Check your voicemail occasionally, especially if you're expecting calls from hospitals, government offices, or other organizations that commonly use private numbers. If you need to receive calls from a specific private number, ask the organization to call from a regular number or to identify themselves in a voicemail so you can call them back.

When blocking private calls might cause problems

Hospitals, emergency rooms, and medical offices often call from private numbers to protect patient privacy. Banks and credit card companies may also use private numbers for security reasons. Schools, government agencies, and delivery services sometimes do the same. If you're expecting a call from any of these, blocking private calls means you'll miss it unless they leave a voicemail.

Before you turn on private call blocking, think about whether you're waiting for calls from any of these sources. If you are, consider waiting until after you receive the call, or ask the organization to call from a public number. You can also turn blocking on and off as needed — it takes seconds to toggle in your phone settings.

Frequently Asked Questions

Will blocking private calls stop spam and scam calls?

Partially. Many spam and scam calls do come from private numbers, so blocking them will stop some. However, spammers also use fake local numbers and spoofed numbers that appear legitimate, which blocking private calls alone won't catch. For better spam protection, use your carrier's spam-filtering service or a third-party app like Nomorobo or RoboKiller.

Can I block private calls but still receive calls from specific numbers?

Not directly through the private call blocking feature. If you need to receive calls from a specific organization that uses private numbers, ask them to call from a different number or to identify themselves in a voicemail. Alternatively, turn off private call blocking temporarily when you're expecting their call.

What if I block private calls and then need to unblock them?

On iPhones, go back to Settings > Phone and toggle "Silence Unknown Callers" off. On Android, open the Phone app, go to settings, find the call-blocking option, and remove "Unknown" or "Private" from the blocked list. If you used your carrier's service, log into your account online or call customer service to turn it off.

Do I need to pay for private call blocking?

No. iPhones and most Android phones have free built-in blocking. Your carrier's service may be free or cost a few dollars per month depending on which carrier you use and which service tier you choose. Check your carrier's website to see what's included in your plan.