In an era of endless promotional spam, loan app harassment, and sophisticated OTP (One-Time Password) scams, protecting your personal phone number in Nigeria has never been more critical. Whether you are a business professional trying to maintain boundaries, someone returning a missed call from an unknown contact, or simply a citizen valuing their privacy under the Nigeria Data Protection Act (NDPA) 2023, you have the right to control who sees your Caller ID.

Hiding your phone number—technically known as suppressing your Caller Line Identification (CLI)—is a standard, free feature regulated by the Nigerian Communications Commission (NCC) and supported across all major networks: MTN, Glo, Airtel, and 9mobile.

This comprehensive guide will walk you through exactly how to hide your number for a single call, how to change your settings permanently, and the broader strategies you need to employ to protect your digital identity in 2026.

Method 1: The Universal Per-Call USSD Code (All Networks)

If you usually want your number to be visible but need to make a quick, anonymous call to a specific person, you do not need to dig through your phone’s settings. You can use the universal Nigerian USSD prefix.

The Per-Call Hidden Code: #31#

To use this, simply open your dialer and type #31# immediately followed by the recipient’s phone number.

• Example: If you are calling 08012345678, you would dial #31#08012345678 and press send.

The person on the other end will see “Private Number,” “Unknown,” or “Blocked” on their screen. Once you hang up, your phone immediately reverts to its normal state. The next call you make without the prefix will show your Caller ID as usual.

To check your current network status: You can dial *#31# on MTN, Glo, Airtel, or 9mobile to see if your outgoing Caller ID is currently enabled or restricted at the network level.

Method 2: Permanent Hiding via Phone Settings

If you prefer to have your number hidden by default for all outgoing calls, adjusting your device settings is the most reliable method.

For Android Users (Samsung, Tecno, Infinix, Xiaomi):

1. Open your Phone app.
2. Tap the Three-Dot Menu (⋮) in the top right and select Settings or Call settings.
3. Navigate to Calling accounts, Supplementary services, or Advanced settings (depending on your brand).
4. Tap on Caller ID and change the selection to Hide number or Never.

For iPhone (iOS) Users:

1. Open the main Settings app.
2. Scroll down and tap on Apps, then Phone (or just Phone on older iOS versions).
3. Tap on Show My Caller ID.
4. Toggle the switch to the OFF position (it will turn grey).

Need a quick fix later? If your phone is set to private by default, you can dial *31# before a number to temporarily unhide your identity for that specific call.

Important Caveats: When Hiding Fails

While hiding your Caller ID is highly effective for standard voice calls, it is not a magic cloak of invisibility. There are strict technical and legal limitations you must understand:

• SMS Text Messages Reveal All: Hiding your CLI strictly applies to voice calls. If you send an SMS text message, the mobile routing metadata will always display your phone number to the recipient.
• Emergency Services See Through It: Under NCC guidelines, if you dial 112 or any official emergency service, your number is automatically unmasked. Dispatchers must have your number for safety and callback purposes.
• Truecaller and Third-Party Apps: Apps like Truecaller rely on crowdsourced address books, not official network data. While dialing #31# usually bypasses a Truecaller ID lookup for that specific call, if your number is saved in someone else’s phone as a spammer, it might still trigger a warning on advanced caller ID apps. (You can visit Truecaller’s website to manually “unlist” your number).
• The “Private Number” Stigma: In 2026, answer rates for unknown numbers are incredibly low. Many Nigerians use built-in features to automatically block or silence private calls. Use this feature wisely, or your calls may be sent straight to voicemail.

The Legal Landscape: Privacy vs. Illegal Call Masking

Under Section 37 of the 1999 Constitution and the NDPA 2023, your phone number is classified as personal data, giving you the lawful right to restrict its broadcast. Telecom operators are mandated by the NCC to provide this CLI restriction free of charge.

However, there is a massive difference between personal privacy and illegal call masking. Call masking (often done using SIM boxes) is a fraudulent practice where international calls are routed to appear as local Nigerian numbers to evade international termination rates. This is a severe criminal offense.

The NCC actively hunts down SIM boxers because they degrade network quality and pose national security risks. Rest assured, using #31# or your phone settings is completely legal; just don’t attempt to use third-party hardware to spoof or mask your number as someone else’s.

Broader Strategies: Beyond Just Hiding Your Number

Hiding your Caller ID is a defensive tactic, but a true privacy strategy in Nigeria requires a layered approach. Here are three crucial steps every Nigerian should take to protect their digital identity:

1. Activate the National “Do Not Disturb” (DND)

If you are hiding your number because you are tired of spam, stop the spam at the source. The NCC mandates all networks to support the DND registry.

• Full Block: Open your SMS app and text the word STOP to 2442. This opts you out of all unsolicited promotional messages from your carrier and third-party marketers.
• Check Status: Text STATUS to 2442.
• Note: This service is completely free across all networks.

2. Lock Down Your SIM Security

With NIN-SIM linkage, your phone number is the key to your bank accounts (BVN), social media, and digital life. A SIM-swap scam can drain your accounts in minutes.

• Set a SIM PIN: Go to your phone’s security settings and set a strong PIN on your physical SIM card. If your phone is stolen, the thief cannot put your SIM in another device to receive your banking OTPs.
• Network-Level Locks: Networks like MTN offer USSD codes (e.g., *785#) to lock your SIM from being swapped without your physical presence and biometric verification at a certified center.

3. Use Virtual or Secondary Numbers (eSIMs/VoIP)

If you frequently buy items on Jiji, date online, or run a small business on WhatsApp, stop giving out your primary NIN-linked phone number.

• Get a Virtual Line: Services like PressOne or global VoIP apps (Numero) allow you to purchase a secondary, cloud-based number.
• The Benefits: You can use these numbers for WhatsApp Business, Telegram, or classified ads. If the number gets spammed, you can simply delete it and generate a new one, keeping your primary, banking-linked number completely private and secure.

Final Thoughts

In today’s hyper-connected Nigerian digital ecosystem, balancing connectivity with privacy is an ongoing challenge. By utilizing USSD codes like #31#, configuring your smartphone settings, and leaning into the NCC’s Do Not Disturb protections, you can reclaim control over your personal data.

Remember: hide your number when privacy is paramount, but for crucial business or family matters, transparency is still the best way to ensure your call gets answered.