How Can I Block My Number When Calling Someone From My Cell Phone?

Maybe you’re calling back a missed number you’re unsure about, reaching out to a Marketplace seller, or you just don’t want your personal number floating around. How can I block my number when calling someone from my cell phone? It’s easier than most people think, and you have options ranging from a one-time code to a permanent setting.

Quick heads-up on etiquette and law first: blocking your caller ID is legal for legitimate privacy reasons, but it’s illegal to use it for harassment, fraud, or evading lawful obligations. And know that some people won’t answer blocked calls at all — which is fair. Here’s how to do it.

How can I block my number when calling someone from my cell phone?

The One-Time Code: *67 (US)

The fastest method for a single call: dial *67 before the number. So instead of dialing 555-123-4567, you dial *675551234567. Your call goes through with ‘No Caller ID,’ ‘Private,’ or ‘Blocked’ on their screen. It works on both iPhone and Android, on all major US carriers, and it’s free. The block applies to that one call only — your next call shows your number normally.

This is perfect for occasional use: calling a business you don’t want having your number, returning a suspicious missed call safely, or any one-off situation. Note that *67 doesn’t work for toll-free numbers (800, 888, etc.) — those systems receive your number regardless, by design. And it won’t hide your number from 911 or emergency services, which is a good thing.

Hiding Your Number for Every Call (Settings)

If you want your number blocked by default, change it in settings. On iPhone: Settings > Phone > Show My Caller ID > toggle off. On Android: Phone app > Settings > Calls > Additional settings > Caller ID > Hide number (the exact path varies by manufacturer — Samsung, Pixel, and others bury it in slightly different places). Once set, every outgoing call hides your number until you toggle it back.

Fair warning: with permanent blocking on, you’ll get sent to voicemail a lot. Many people — especially businesses — auto-reject blocked calls, and spam filters treat them suspiciously. I recommend the *67 approach for most situations and reserving the permanent setting for specific periods (like when you’re job hunting and calling recruiters from your personal phone, or dealing with a difficult situation). You can also ask your carrier to enable per-line blocking on your account, which some carriers do for free.

What Blocking Can’t Do (Honest Limitations)

Let’s be clear about what caller ID blocking doesn’t hide. It doesn’t anonymize you from the phone company, law enforcement, or the person you’re calling if they have trap/trace services. It doesn’t work on toll-free or some business phone systems. And if you’re trying to avoid someone who already knows your number, blocking caller ID won’t stop them from recognizing your voice or calling back the carrier’s records.

If your goal is ongoing privacy — like selling things online regularly — consider a second number instead. Google Voice gives you a free second number that forwards to your phone, so Marketplace buyers and strangers never see your real number at all. It’s more practical than *67-ing every call. And if unwanted calls are coming TO you rather than from you, see how to stop spam calls without blocking real contacts.

Quick Answers

• One call: dial *67 before the number (e.g., *675551234567). Free, works on iPhone and Android.
• Every call (iPhone): Settings > Phone > Show My Caller ID > off.
• Every call (Android): Phone app > Settings > Calls > Caller ID > Hide number.
• Carrier option: ask Verizon/AT&T/T-Mobile to enable line-level blocking.
• Doesn’t work for: toll-free numbers, 911, or against determined tracing.
• Better for ongoing privacy: free Google Voice second number for strangers and sellers.
• Remember: many people auto-reject blocked calls — use sparingly.

The Bottom Line

Blocking your number when calling from your cell phone is simple: *67 before the number for one-off calls, or the caller ID setting for permanent blocking. Both are free and built into every phone.

Use it thoughtfully — for privacy with strangers, businesses, or sensitive situations. And if you find yourself needing it constantly, get a free second number instead; it’s cleaner for everyone. Just don’t expect it to make you untraceable, because it won’t — it’s a privacy curtain, not an invisibility cloak.

Frequently Asked Questions

Does *67 work on text messages?

No — *67 only affects voice calls. Text messages always show your real number (or your messaging app’s identity). There’s no built-in way to send an anonymous SMS from your regular number. If you need private texting, use a second-number app like Google Voice — texts come from that number instead. Anyone promising anonymous texting from your real number is selling something sketchy.

Can someone unmask a blocked number?

Ordinary people can’t — but it’s not hard for determined parties. If you harass someone from a blocked number, they can involve law enforcement or their carrier, who can trace it. Businesses with ANI (Automatic Number Identification) systems — especially toll-free numbers — see your number regardless of *67. And if the person saves your voicemail, your voice identifies you anyway. Caller ID blocking is privacy from casual viewers, not anonymity from investigation.

Why do some of my calls show as ‘Spam Likely’ when I block my ID?

Because blocking your caller ID looks exactly like what scammers do. Carriers’ spam filters flag withheld numbers aggressively, and many people auto-reject them. It’s the paradox of *67: the more you hide your number, the more suspicious you look. For legitimate calls to businesses, showing your number (or using a Google Voice number) gets better results than blocking. The FCC’s caller ID guide explains how the system works and its limits.

Is there a way to block my number for texts to businesses?

Use a Google Voice number — it’s free, gives you a separate number for calls and texts, and keeps your real number private permanently. It’s better than *67 for ongoing needs: no codes to remember, works for texts, and you can abandon the number if it gets spammed. For one-off privacy, though, *67 on a call remains the simplest tool. And if you’re tightening privacy generally, review app location tracking settings — your number is only one piece of your digital footprint.