Hiding your number on outgoing calls takes about thirty seconds, but there are three different ways to do it and each has a tradeoff. This guide covers the per-call code, the permanent caller-ID block from your carrier, and the second-number approach — what each does, what it costs in convenience, and when to use which.
What “Private Number” Actually Means
When you make a call, your phone sends two pieces of information to the recipient: the actual phone number used for routing, and a caller-ID name and number that the recipient’s phone displays. Making your number “private” means suppressing the second piece — the displayed caller ID — while the routing information still travels normally so the call connects.
The person on the other end sees “Private,” “Blocked,” “Unknown,” “No Caller ID,” or “Restricted” depending on their carrier. The call itself works the same way it always does. Your number is not erased; it is hidden from the display. Carriers, 911 dispatchers, toll-free numbers, and law enforcement with the right authorization can still see who is calling, regardless of what you do. Privacy here is privacy from the person you are calling, not privacy from the phone system.
Three methods get you there, and you pick based on whether you want the block on one call, every call, or only when you choose to use a separate identity.
Method 1 — Per-Call Privacy With *67
The fastest method works on every major US carrier — Verizon, AT&T, T-Mobile, and the MVNOs that ride on them. Dial *67, then the full phone number you want to reach, then press call. Your caller ID is suppressed for that one call only. Your next call goes through normally with your number visible.
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Browse 212 Numbers →This is the right method when you want most of your calls to show your number — to family, your bank, your doctor — but want a single call to a stranger or a business to stay anonymous. Selling something on Craigslist or Facebook Marketplace, calling about an apartment listing, returning a missed call from an unknown number — these are the common cases.
A few things *67 will not do. It does not work when dialing 911; emergency services see your number no matter what. It does not work when dialing toll-free numbers (800, 833, 844, 855, 866, 877, 888), because the toll-free owner pays for the call and gets your caller ID through a separate billing system called ANI. And many people decline calls from “Private” or “Unknown” numbers entirely, so a hidden caller ID can be the reason your call goes straight to voicemail.
Method 2 — Permanent Caller-ID Block
If you want every outgoing call to hide your number by default, your carrier can flip a switch on your account called per-line caller ID blocking. The toggle exists in the consumer app or settings page for all three majors:
On iPhone, open Settings, scroll to Apps and find Phone, tap “Show My Caller ID,” and turn it off. On Android, open the Phone app, tap the three-dot menu, go to Settings, then Calls or Calling Accounts, then Additional Settings or Caller ID, and select “Hide number.” If the toggle does not appear on your phone, your carrier has not exposed it on this line — call them and ask to enable per-line caller ID blocking. There is no fee for this on Verizon, AT&T, or T-Mobile.
Once it is on, every outgoing call is anonymous unless you override it. To unblock a single call when the line is permanently blocked, dial *82 before the number. This is the inverse of *67 — same one-call scope, opposite effect.
The tradeoff with permanent blocking is reach. A persistent “Private” caller ID raises the rate at which your calls go unanswered, get screened by call-filter apps, or land in voicemail. If you make outbound business calls or want recipients to call you back, permanent blocking will cost you. It is the right setting for someone whose phone is mostly for personal use and who almost never wants the recipient to keep the number.
Method 3 — A Second Number You Use Selectively
The third approach is structural rather than technical: keep your real number private by not giving it out in the first place, and use a separate number for situations where you don’t fully trust the recipient. This is the strategy used by anyone who lists a phone number on a website, takes side-business calls, dates online, sells items online, or runs a service that needs a callback line.
The mechanics work like this. You buy or claim a second phone number — usually a VoIP number from a service like Google Voice, or a dedicated cell-quality number you can port to your cell phone. Calls to the second number ring your real phone, but the recipient only ever sees the second number when you call them. Your personal line stays known only to people you trust.
This is the approach most relevant for anyone who wants the credibility of a Manhattan 212 area code on outbound calls — for business, for client work, for an apartment listing, for any context where a New York presence matters — without exposing the cell line they actually use for friends and family. A 212 number works as a second-number layer the same way Google Voice does, but with the added weight of a real Manhattan caller ID rather than the more generic VoIP feel some recipients associate with Google Voice numbers.
The cost is a one-time number purchase (no monthly fee, since you port it to your existing cell line). The privacy benefit is structural: your personal number is never exposed, so it cannot be saved, shared, looked up, or sold by data brokers harvesting from business contacts.
Which Method Should You Use?
The three methods solve different problems and they stack rather than compete.
Use *67 for one-off calls where you want anonymity for a single conversation — checking on an item for sale, calling back an unknown number, contacting someone you don’t want to give your number to. No setup, no commitment, works on any line.
Use permanent caller-ID blocking if your phone is for personal use only and you almost always prefer the recipient not see your number. Accept that callbacks become harder and that some recipients will not answer at all.
Use a second number if you have a public-facing reason to give out a phone number — business, side work, online listings, dating — and want your personal line to stay genuinely private rather than just hidden on one call. This is the only one of the three that protects your real number from being captured in the first place.
Many people combine them: a personal cell with caller ID on for friends and family, *67 for the occasional anonymous call, and a separate 212 number for anything public. Each layer covers a different part of the problem.
Frequently Asked Questions
Does *67 work on every US carrier?
Yes. Verizon, AT&T, T-Mobile, and every major MVNO support *67 for per-call caller ID blocking on standard 10-digit US numbers. It does not work for 911 calls or toll-free numbers (800, 833, 844, 855, 866, 877, 888).
Can the person I call still find out who I am if my number is private?
Not from the phone display. Carriers and 911 dispatchers can see your number regardless of any blocking, and toll-free recipients receive your number through a separate billing channel. But a normal person receiving a normal call from a private number sees only “Private” or “Unknown” — no name, no number.
Will making my number private stop spam calls to me?
No. *67 and caller-ID blocking only affect outgoing calls — they hide your number from people you call. They do nothing about calls coming in. To block unwanted callers, you need carrier-level spam filtering plus phone-level blocking. We have separate guides for blocking on iPhone and Android.
Does private number blocking cost extra?
No. None of the three major carriers charges for *67 per-call blocking or for permanent per-line caller ID blocking. Both are standard features. If a carrier asks you to pay for caller-ID privacy, that is unusual and worth questioning.
Why do some people refuse to answer calls from private numbers?
Because most legitimate callers leave their caller ID visible. A hidden number, in many people’s experience, signals a robocall, a debt collector, or a scam, so a meaningful share of recipients send “Private” calls straight to voicemail or decline them outright. If you need someone to answer, hiding your number works against you.
Can I unblock my number for a single call if my line is permanently blocked?
Yes. Dial *82 before the number you want to call. Your caller ID will appear normally for that one call, and the next call reverts to your line’s default setting.
If I use a second phone number, do I have to carry a second phone?
No. A 212 area code number can be ported directly to your existing cell line so both your personal number and your 212 number ring the same device. You answer them the same way; only the outgoing caller ID differs depending on which number you call out from. The eSIM approach makes this especially clean on modern iPhones and Android phones.
Does *67 work for text messages?
No. *67 is voice-call only. Text messages always carry sender information that the recipient’s phone can see. To send texts without exposing your real number, you need a separate texting number through an app or a dedicated second line.
Can I see my own number when it shows up as private to others?
Yes. Privacy settings affect what your recipient sees. You can confirm your line is set correctly by calling another phone you own that displays caller ID, and checking whether it shows your number or “Private.”
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