Today, almost every person has an “Unknown number” or “Hidden subscriber” entry in their contacts. When the words “Unknown”, “Private Number” or “Hidden Number” appear on the smartphone screen instead of numbers, this causes a mixed reaction: from curiosity to fear. Anonymous call is a standard telephony feature that allows the caller to hide his Caller ID from the receiving party.
Many users wonder why such an opportunity even exists and whether it violates the law. In fact, CLIR technology (Calling Line Identification Restriction) was implemented by telecom operators back in the era of analog telephony to protect privacy. Hide number may be necessary for doctors, security officers, journalists, or simply people who want to separate their personal lives from work contacts.
However, not only conscientious citizens, but also scammers often hide behind the veil of secrecy. Understanding how this function works will help you not only protect your data, but also configure it correctly call privacy on your own device. In this article we will look at the technical and legal aspects of using hidden numbers.
Technical aspects: how it works
From a technical point of view, the process of transmitting information about the caller occurs through the signaling channels of the telephone network. When you make a call, your SIM card and phone send a data packet containing your number to the operator's network. If the function is activated CLIR, a special label is added to this package that prohibits the number from being displayed on the subscriber’s side.
It is important to understand that a “hidden number” does not mean complete invisibility. Telecom operator in any case, he sees who is calling whom, since the billing (accounting system) must record the connection for charging or simply for logging traffic. Hiding occurs only at the level of the receiving subscriber's end device or at the PBX level if the call is made through a corporate network.
There are two main ways to implement this function: permanent and one-time. Permanent hiding configured in the phone menu or through a request to the operator's USSD code, after which all outgoing calls will go without number identification. One-time hiding involves the use of special prefixes before dialing digits, which is convenient for single anonymous calls.
Technical detail
Can a hidden number be tracked?: Yes, technicians and law enforcement can request caller information from your carrier even if the number has been hidden. There is no absolute anonymity in cellular networks.
Why do they hide the number: reasons and scenarios
The motivation of users can be very different, and it is not always associated with the desire to harm someone. Most often anonymity required by representatives of certain professions. For example, psychologists working with crisis centers or law enforcement officers conducting operational activities are required to hide their personal data.
The business segment is also actively using this feature. Call centers Banks, delivery services and courier services often disguise employee numbers under a common short number or hide them so that customers do not call back directly to the employee’s mobile phone. This increases discipline and maintains personal boundaries among staff.
On the other hand, there is also a negative use case. Fraudsters and spammers actively use number maskingto bypass blocking in “Blacklists” and phone books of victims. If they call you from a hidden number and are silent or offer you a “profitable investment,” there is a 99% chance that this is an attempt at fraud.
- 📞 Professional ethics: protection of personal data of doctors, lawyers and psychologists.
- 🏢 Corporate Security: calls on behalf of the company, not a specific employee.
- 🛡️ Personal safety: Calls from victims of domestic violence or stalking.
- 🕵️ Investigative journalism: the need to hide a source or reporter.
How to hide a number on Android and iPhone
If you decide that you need to hide your number when calling, you can do this directly in the smartphone settings. The process is slightly different depending on the operating system, but the essence remains the same - you need to find the parameter Caller ID or Caller ID.
On devices Android the path may vary depending on the OS version and the manufacturer’s shell (Samsung, Xiaomi, Pixel). Typically, you need to open the Phone app, tap the three dots in the corner, select Settings, then More settings or Accounts. There you will find the “Caller ID” item, where you can select the “Hide number” option.
Owners iPhone (iOS) it's even easier. You need to go to "Settings" → "Phone" → "Show my number". The switch must be turned off (gray color) for the number to be hidden. Please note that some carriers may block this feature at the network level, causing the slider to be disabled on your phone.
☑️ Checking privacy settings
It is worth remembering that when you activate this feature, you become “invisible” to everyone you call. This can cause confusion among interlocutors, since many people simply do not pick up the phone from unknown numbers. Therefore use permanent hiding recommended only in specific situations.
Codes and commands to hide a number
In addition to the settings in the menu, there are universal USSD codes and prefixes that allow you to control the display of the number on the fly. This is especially convenient if you do not want to change global phone settings, but plan to make just one anonymous call.
To hide a number one-time, you must enter a special code before dialing the main number. In the GSM standard (used in Russia and Europe) this is the code #31#. For example, to anonymously call 89001234567, you need to dial #31#89001234567 and press the call button.
There are also codes to control the service at the operator level. They may vary depending on your provider (MTS, Beeline, Megafon, Tele2), but the basic commands often work:
- 🔒
#31#— hide the number for a specific call (before the number). - 🔓
*31#— show the number if hiding is enabled by default. - ⚙️
*#31#— checking the status of the number hiding service.
| Operator | Activation code (permanent) | Deactivation code | Checking status |
|---|---|---|---|
| MTS | *111*178# |
*111*179# |
*111*178*2# |
| Beeline | *119*1# |
*119*0# |
*119# |
| Megaphone | *31# |
#31# |
#31# |
| Tele2 | *129# |
#129# |
*129# |
Before using codes, check with your operator for their relevance, as combinations may vary depending on the region and tariff plan.
How to determine who is calling from a hidden number
The most common question from users is: “Can I see who is hiding behind this number?” Direct legal ways to do this for an ordinary subscriber doesn't exist. Telecom operators are required to keep this information confidential (legislation on personal data), and can only disclose it at the request of law enforcement agencies.
However, there are workarounds that may help in some cases. One of them is the use of services caller ID from the operator itself or third-party applications. Sometimes, even if the number is hidden by the subscriber, applications like Yandex.Phone or GetContact can show the owner’s name if someone has this number written down in their contacts, although this does not work with a 100% guarantee.
Another method is to use the Call Back function. If you hang up the call or send an SMS (if the number is not completely blocked), the subscriber may call you back from a regular number to find out who was looking for them. But this method only works if a person really wants to get in touch.
⚠️ Attention: The Internet is full of sites and programs that offer to “break through” a hidden number for money. In 99% of cases, these are scammers who will either steal your money or infect your device with a virus. Don't believe in "magic programs" for hacking operator databases.
Legal aspects and security
Using the number hiding function in Russia and most CIS countries is completely legally. The Law on Communications does not prohibit subscribers from hiding their ID when making outgoing calls. However, if hiding the number is used to commit illegal actions (threats, fraud, hooliganism), this becomes an aggravating circumstance.
Law enforcement agencies have the technical capabilities to request from the telecom operator complete information about calls, including hidden numbers, as part of a criminal case. Therefore, the illusion of complete impunity when using anonymous calls dangerous.
For ordinary users, it is important to know their rights. If you receive threats or insults from hidden numbers, you must:
- Record the time and date of calls.
- File a police report.
- At the request of the investigator, the police will receive data from the operator.
Hiding your number is a privacy protection tool, not a way to evade responsibility for illegal actions.
Frequently asked questions (FAQ)
Is it possible to permanently block calls from hidden numbers?
It is impossible to completely block incoming calls from hidden numbers at the operator level in Russia. However, smartphones (Android and iOS) have a feature called "Block Unknowns" or "Silent Mode" that automatically rejects or does not call numbers not saved in the contact book. This is the most effective way to fight.
Do they charge money for the number hiding service?
In most tariff plans of large Russian operators (MTS, Beeline, Megafon, Tele2), the number hiding service is provided free of charge. However, some archival plans or roaming plans may incur small subscription fees. It is recommended to check the terms of your tariff in your personal account.
What does it mean if they call me from a hidden number and are silent?
Most likely, this is an automatic dialer (robot) or an active number detector. Fraudulent systems call thousands of numbers to check if the line is working and if a live person answers. After the answer, the number is marked as "active" and sold to other spammers. It is best to reject such calls.
Can the police find a person using a hidden number?
Yes, it can. The telecom operator sees the real number of the caller, regardless of the CLIR settings. To obtain this data, the police must open a criminal case and send an official request to the communication provider company.