How to Block Your Phone Number on iPhone When Making Calls

Hiding your caller ID on an iPhone is straightforward once you know where the setting lives — but whether it actually works depends on a few factors that vary by carrier, region, and even the type of call you're making. Here's what you need to know before assuming your number is hidden.

What "Blocking Your Number" Actually Means

When people talk about blocking their phone number on iPhone, they typically mean hiding their caller ID so the person they're calling sees "No Caller ID," "Private Number," or "Unknown" instead of their actual phone number.

This is different from:

• Blocking someone from calling you (that's Contact Blocking, under Settings > Phone > Blocked Contacts)
• Hiding your number from apps like WhatsApp or FaceTime, which use their own systems
• Preventing your number from appearing in carrier records — that's not possible through device settings

The feature you're looking for is called Show My Caller ID, and it controls what appears on the recipient's screen when you make a standard cellular call.

How to Turn Off Caller ID on iPhone (Step by Step) 📱

1. Open Settings
2. Scroll down and tap Phone
3. Tap Show My Caller ID
4. Toggle the switch to off

Once disabled, outgoing calls will display as "No Caller ID" or a similar label on the recipient's end. The toggle takes effect immediately — no restart required.

Hiding Your Number for a Single Call

If you don't want to disable caller ID permanently, you can block your number on a per-call basis by dialing a prefix before the number:

• In the US and Canada: Dial *67 before the number (e.g., *67-555-867-5309)
• In the UK: Use 141 before the number
• In most of Europe: Use #31# before the number

This works regardless of your Show My Caller ID setting — useful when you want privacy for one specific call without changing your default behavior.

Why the Setting Might Not Work 🔍

Here's where individual results start to diverge. The Show My Caller ID toggle can be grayed out or ineffective depending on:

If the toggle appears grayed out, the most common cause is a carrier-level restriction. Contacting your carrier directly is the only way to confirm whether suppression is supported on your specific plan.

Caller ID Behavior Across Different Call Types

This is an important variable that many guides skip over. The Show My Caller ID setting only applies to standard cellular calls. Each communication method handles caller identity differently:

• Standard cellular calls: Controlled by the iPhone setting and carrier support
• FaceTime Audio: Uses your Apple ID; caller ID rules don't apply
• WhatsApp / Telegram / Signal: Your registered phone number is tied to your account, not the device's caller ID settings
• Google Voice: Has its own caller ID settings within the app
• VoIP apps (Skype, etc.): Display whatever number or ID is associated with your account

If your goal is to make calls without revealing your personal number across multiple platforms, the path forward looks different depending on which apps and services you're using.

What the Other Person Sees — and Doesn't

When caller ID suppression works, the recipient's phone displays a label like "No Caller ID," "Private," "Unknown," or "Withheld" — the exact wording depends on their device and carrier.

A few nuances worth knowing:

• Recipients can choose to block "No Caller ID" calls entirely — many people do, so hiding your number doesn't guarantee the call goes through
• Some carriers offer services to unmask hidden numbers — these are used primarily in harassment or safety situations
• The suppression is one-directional: the recipient won't see your number, but your carrier still has a complete record of the call

The Variables That Determine Your Situation

How well this works in practice depends on a combination of things unique to your setup: your carrier and plan type, whether your device is managed by an organization, which apps you're calling through, and whether the person you're calling has settings that reject private numbers.

Someone on a consumer plan with a major US carrier will likely find the toggle works exactly as expected for standard calls. Someone on a corporate-managed iPhone, calling internationally, or relying on VoIP apps may find the process involves more steps — or that device-level settings don't address their actual use case at all.

The iPhone setting is a good starting point, but understanding which type of call you're making and what your carrier supports tells you most of what you actually need to know.