Private calls can be blocked on most phones, but the method depends on your device type and carrier
A private call is one where the caller's number does not display — you see "Private," "Blocked," "Unknown," or no number at all. Most phones let you reject these calls automatically without answering. iPhones use the "Silence Unknown Callers" feature, Android phones have a "Block Unknown" or "Block Private Numbers" setting, and some carriers offer network-level blocking through their own apps or online accounts. The exact steps vary, so you will need to know whether you use an iPhone, Android phone, or a flip phone, and whether you want to block at the device level or through your carrier.
Blocking private calls means you will miss calls from hospitals, schools, and businesses that use private numbers to protect their internal phone systems. Before you turn on blocking, consider whether you need to receive those calls and check your voicemail regularly if you do block them.
Key Takeaways
- iPhones running iOS 13 or later can silence unknown callers automatically through Settings > Phone > Silence Unknown Callers, which sends private calls straight to voicemail.
- Android phones have a "Block Unknown" or "Block Private Numbers" option in the Phone app settings, though the exact name and location varies by manufacturer.
- Your carrier — Verizon, AT&T, T-Mobile, or others — may offer a separate app or online tool to block private calls at the network level before they reach your phone.
- Blocking private calls means you will miss calls from hospitals, schools, and businesses that use private numbers, so consider whether you need to receive those calls first.
How to block private calls on an iPhone
On an iPhone running iOS 13 or later, open Settings and tap Phone. Scroll down and turn on "Silence Unknown Callers." This sends any call from a number not in your contacts directly to voicemail — the phone will not ring, and you will see a missed call notification instead. The caller hears a voicemail prompt as if you did not answer.
If you use an older iPhone running iOS 12 or earlier, you cannot silence unknown callers at the system level. Instead, you can block individual numbers after they call you: open the Phone app, find the call in your recents, tap the info icon next to the number, and select "Block this Caller." This blocks that specific number but does not block all private calls. You can repeat this process for each number that bothers you, though it takes more time than turning on a single setting.
How to block private calls on Android
Android phones have a built-in option to block unknown or private numbers, but the exact location depends on your phone's manufacturer. On most Android phones, open the Phone app, tap the three-dot menu, and look for "Settings" or "Call Settings." From there, find "Block Numbers," "Spam Protection," "Call Blocking," or "Block Unknown Calls" — the wording varies. Turn on the option to block unknown or private numbers.
If you cannot find this setting in the Phone app, try opening your phone's main Settings app, searching for "call blocking" or "unknown calls," and enabling the option there. Some manufacturers like Samsung, Google, and OnePlus place this setting in different locations, so searching is often faster than navigating menus. Once you turn on the setting, unknown callers will go straight to voicemail without your phone ringing.
Blocking private calls through your carrier
Your phone carrier — Verizon, AT&T, T-Mobile, or another provider — may offer a separate service to block private calls at the network level. This happens before the call reaches your phone, so you will not see a missed call notification. Verizon offers "Call Filter," AT&T offers "Call Protect," and T-Mobile offers "Scam Shield." These apps or services often cost a few dollars per month, though some carriers include basic versions for free.
To set up carrier-level blocking, log into your carrier's website or app and look for call blocking, spam protection, or call filtering options. You can usually turn on blocking for private numbers, spam calls, or both. Some carriers let you block at the network level and also use the device-level setting at the same time, which provides extra protection. Carrier blocking has one advantage over device-level blocking: it can block calls before they reach your phone, so you will not see them in your missed calls at all.
What happens when you block private calls
When you block private calls, the caller will not hear a busy signal or a rejection message. Instead, they will hear a voicemail prompt or the call will ring once and disconnect. Some callers may try again, while others will leave a voicemail if they have an important reason to reach you.
The main risk is that you will miss calls from legitimate sources that use private numbers. Hospitals, schools, government offices, and some businesses call from private numbers to protect their internal phone systems. If you block all private calls, you may not know you have a missed call from your child's school or a doctor's office until you check voicemail hours later. If you find you are missing important calls, you can turn off the blocking and instead block individual numbers after they call.
Unblocking private calls if you change your mind
On an iPhone, open Settings > Phone and turn off "Silence Unknown Callers." The setting will take effect when ready, and unknown callers will ring through again.
On Android, open the Phone app settings, find the call blocking or unknown call option, and turn it off. If you blocked the setting through your carrier's app, open that app and disable the blocking there instead. If you blocked individual numbers and want to unblock them, open your Phone app, find the blocked number in your recents or contacts, tap the info icon, and select "Unblock this Caller."
Blocking specific numbers instead of all private calls
If you do not want to block all private calls but you have a specific number that keeps calling you, you can block just that number. On an iPhone, open the Phone app, find the number in your recents, tap the info icon, and select "Block this Caller." On Android, do the same: find the number in your recents or call log, tap the info icon, and select "Block" or "Block Number."
This approach lets you receive calls from unknown numbers while still rejecting the ones that bother you. If the caller uses a different number each time, blocking individual numbers becomes tedious, and you may want to use the full unknown call blocking instead. Keep a list of blocked numbers so you can unblock them later if needed.
Frequently Asked Questions
Will the caller know I blocked them?
No. The caller will hear a voicemail prompt or the call will ring once and disconnect. They will not receive a message saying you blocked them. Some callers may assume you did not answer, while others may realize the call was rejected, but they will not know whether you blocked them specifically or straightforward did not pick up.
Can I block private calls but still receive calls from my bank or doctor?
Not automatically. If your bank or doctor calls from a private number, blocking all private calls will block them too. You can ask your bank or doctor for their direct number and add it to your contacts, or you can turn off private call blocking and block individual numbers instead. Some carriers' apps let you create a whitelist of numbers to allow through, which may help.
Do I need to pay to block private calls?
No. The built-in blocking on iPhones and Android phones is free. Your carrier may offer additional blocking services for a fee, but you do not need to pay for basic private call blocking.
What if I block private calls but still get calls from a private number?
Some calls may bypass your blocking if they come from certain networks or if there is a technical issue. If a specific private number keeps reaching you, try blocking that individual number instead. If the problem continues, contact your carrier — they may be able to block it at the network level.
Can I block private calls on a flip phone or basic phone?
Most basic phones do not have a built-in setting to block unknown or private calls. Contact your carrier to ask whether they offer network-level blocking for your phone. Some carriers can block private calls at the network level even if your phone does not have the feature built in.