How to Block Call Display on Your Phone Line

What does blocking call display do?

Blocking call display withholds your phone number from the person you are calling, so their screen shows "Blocked", "Private", "Restricted", or "No Caller ID" instead of your digits. The call connects normally in every other respect; only the identification travelling with it is suppressed.

There are two ways to do it, and choosing the wrong one is the usual reason it does not work: a prefix that blocks one call, or a setting on your line that blocks every call.

How do you block call display for one call?

1. Open the dialer keypad. Do not tap a saved contact, because that dials the stored number exactly as saved and drops anything you typed in front of it.
2. Type the blocking prefix. On most US lines it is *67.
3. Type the full number immediately after, area code included, with no space, no pause, and no plus sign between the two parts.
4. Look at the dialed string before you press call. The prefix must be at the front.
5. Ask the person afterwards what they saw. That is the only real confirmation.

The prefix affects that one call. Every other call from the phone continues to send your number.

How do you block call display on every call?

Blocking every call is a carrier setting on your line, not a switch inside the phone. It is often called line blocking or permanent blocking, and it is arranged through your account rather than through the settings menu.

1. Sign in to your carrier account at the company’s official website and look through the features listed for the specific line.
2. If a caller ID or privacy option is offered there, apply it to that line and note the date.
3. If it is not offered online, ask carrier support for permanent call display blocking, naming the exact line.
4. Test it by calling someone who will report what appeared on their screen. Do not rely on the confirmation message alone.
5. Learn the unblocking prefix at the same time, because you will need it for calls that must be identified.

Does the setting in my phone do the same thing?

Many handsets have a caller identification option inside the phone app's call settings, with choices such as network default, hide number, or show number. That option is a request to the network, not a change made inside the phone.

If your carrier does not honor the request, the setting will sit there looking enabled while your number continues to be delivered. Treat it as unverified until a real call proves otherwise, and prefer the carrier-side setting when it matters.

Why is my number still displayed?

• The dial string was wrong. A pause, a space, or a plus sign between the prefix and the number makes the network read the prefix as part of the number.
• You called a toll-free line. Toll-free service receives the originating number through the billing record, which blocking does not touch.
• You called emergency services, which always receive the calling line by design.
• The call was placed inside a calling app or an internet phone service, which builds its own caller identification. A prefix typed into such an app is usually treated as digits or rejected outright.
• You dialed internationally. The prefix is a North American convention and does not travel.

Why are my blocked calls not being answered?

Blocking makes the call much easier to filter on the receiving side, and the filtering happens before the phone rings:

• Anonymous call rejection, a carrier feature on the other person's line, intercepts calls without caller identification and plays a message asking the caller to unblock.
• Handset features that silence unknown callers send anything not in the contact list straight to voicemail. A call with no number is unknown by definition and cannot be added in advance.
• Call screening answers first and asks the caller to state a name.
• Business and clinic phone systems commonly refuse anonymous calls, because they cannot log or return them.

There is no prefix or setting on your side that forces a filtered phone to ring.

How do you unblock call display for a single call?

If your line has permanent blocking on it, release your number for one call by dialing the unblocking prefix first, typed exactly like the blocking prefix. On most US lines it is *82. This affects only that call and leaves the line setting untouched.

Use it deliberately before calling a bank, a clinic, a school office, or anyone who needs to be able to call you back. Forgetting it is the most common reason a permanently blocked line seems to have random unreachable destinations.

Blocking your display versus blocking incoming calls

These two are often confused because people use the same words for them. Blocking call display controls what other people see when you call them. Blocking a caller stops a specific number from reaching you, and is done in your phone's blocked-numbers list or through a carrier feature.

If your problem is unwanted calls arriving, the blocking prefix does nothing for you. Look instead at your handset's blocked list, the silence-unknown-callers feature, and the call filtering your carrier offers on your line.

What blocking does not hide

Withholding your number hides one display field and nothing else. Your carrier records the call, the receiving carrier records it, emergency services receive your line, and a recipient receiving abusive calls can ask their carrier about tracing calls that arrived with no identification.

It also does nothing about a number that is already known. If your number is saved in their contacts, or you have texted them before, or you called their business last month, blocking the display changes what one screen shows and not who they think is calling.