There are legitimate reasons to make a phone call without displaying your personal number: protecting your privacy when contacting a business, responding to an online marketplace listing, or calling someone you do not know well. A private call can be useful, but it should be handled responsibly. Hiding caller ID does not make a call untraceable, and it should never be used to threaten, harass, impersonate, or deceive anyone.
TLDR: To make an unknown or private phone call, you can usually dial a caller ID blocking code before the number, change caller ID settings on your phone, or ask your carrier to block your number by default. In the United States and Canada, the common per-call code is *67, though availability varies by carrier and country. Private calling does not work in every situation, and emergency services, carriers, and authorities may still be able to identify the caller. Use private calling only for lawful and appropriate privacy reasons.
What “Private” or “Unknown” Calling Means
When you make a standard phone call, your phone number is typically sent to the recipient’s caller ID display. If you block caller ID, the recipient may see labels such as Private Number, Unknown Caller, No Caller ID, or Blocked. The exact wording depends on the recipient’s phone, carrier, and country.
It is important to understand the limits. Caller ID blocking hides your number from the person receiving the call, but it does not erase network records. Your mobile provider, landline provider, and in some cases the recipient’s provider may still have technical logs of the call. If there is a legal investigation, those records may be accessible through proper legal procedures.
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Method 1: Use a Per-Call Blocking Code
The quickest way to make a private call is often to enter a short code before dialing the phone number. This blocks caller ID for that single call only.
- United States and Canada: Dial *67, then enter the phone number. Example: *67 555 123 4567.
- Some mobile networks: Dialing #31# before the number may block caller ID for that call.
- United Kingdom and some other regions: Codes may differ, so check your carrier’s official support page.
After placing the call, your normal caller ID settings usually resume automatically. This option is useful if you only need privacy occasionally and do not want to change your phone’s permanent settings.
Before relying on this method, test it by calling a trusted friend or a second phone. Different carriers may handle caller ID blocking differently, especially for international calls, VoIP numbers, or business phone systems.
Method 2: Change Caller ID Settings on Your Phone
Most smartphones include a setting that lets you hide your caller ID for outgoing calls. The exact menu names may vary depending on the phone model, operating system version, and carrier.
On iPhone
- Open Settings.
- Tap Phone.
- Select Show My Caller ID.
- Turn the option off, if available.
If you do not see this option, or if it is unavailable, your carrier may control caller ID blocking at the network level.
On Android
- Open the Phone app.
- Tap the menu icon, usually shown as three dots.
- Go to Settings or Calling accounts.
- Look for Caller ID, Additional settings, or Supplementary services.
- Select Hide number if the option is available.
Android menus differ widely between Samsung, Google Pixel, Motorola, and other devices. If you cannot find the setting, search your phone settings for caller ID or contact your carrier.
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Method 3: Ask Your Carrier for Permanent Caller ID Blocking
If you regularly need to keep your number private, your mobile or landline carrier may be able to enable caller ID blocking by default. This means your number is hidden automatically on outgoing calls unless you choose to unblock it for a specific call.
When speaking with your carrier, ask about:
- Permanent caller ID blocking for all outgoing calls.
- Per-call unblocking codes if you sometimes need your number to appear.
- Restrictions on calls to businesses, toll-free numbers, or international numbers.
- Fees or plan limitations, especially for landlines or business accounts.
This is often the most reliable option for professionals who need privacy, such as medical workers, social workers, journalists, or people calling clients from a personal device.
Cases Where Caller ID Blocking May Not Work
Private calling is not guaranteed in every situation. Some recipients automatically reject blocked numbers. Others use screening tools that send unknown callers to voicemail. Certain businesses, call centers, and toll-free numbers may receive billing or routing information that differs from ordinary caller ID.
Emergency calls are also different. In many countries, your number and location information may be provided to emergency services even if you have caller ID blocking enabled. This is intentional and exists to protect public safety.
You should also avoid assuming that internet-based calling apps provide complete anonymity. VoIP services, messaging apps, and temporary number apps may still keep account data, IP logs, payment information, or device identifiers. Read the service’s privacy policy before relying on it for sensitive communication.
Responsible Uses for Private Calling
Using caller ID blocking can be reasonable when your goal is personal safety or privacy. Examples include contacting a seller from a classified ad, calling a company to ask questions without joining a marketing list, or returning a call when you do not want your personal mobile number stored.
However, private calling should not be used to evade accountability. Do not use it for repeated unwanted calls, intimidation, fraud, prank calls, or impersonation. In many places, harassment by phone is illegal whether or not the caller ID is hidden.
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Practical Tips Before You Call
- Test first: Confirm that your number appears as private before making an important call.
- Leave a clear message: If you want a response, explain who you are and why you are calling.
- Respect boundaries: If someone does not answer private calls, use another appropriate contact method.
- Consider alternatives: For ongoing communication, a dedicated work number or secondary line may be more transparent and professional.
Making an unknown or private phone call is usually straightforward, but it is not a guarantee of anonymity. The best approach is to use the available tools carefully, understand their limits, and keep your purpose legitimate. Privacy is valuable, but it works best when paired with respect, honesty, and responsible communication.