Mobile phones have become much more than just devices for making calls, but one of the most valued features is the ability to hide the phone number when making a call, whether for privacy reasons, to prevent strangers or companies from collecting our number, or for specific situations in which we don't want to be identified. This feature, known as "hidden number" or "private number," is available on all modern cell phones and can be activated in several ways. We'll explain All the possible options for calling with a hidden number on Android, when it is useful, its advantages and even possible legal limitations.
Why call with a hidden number?
There are multiple Reasons to hide your number when you callThe most common ones include preserving your privacy when contacting strangers, avoiding spam calls, or preventing certain companies or individuals from saving your number to return calls without your consent. It can also be useful if you carry out personal errands, make secondhand sales, inquire about services where you don't want to be identified, or simply seek anonymity in certain contexts.
Hiding your number does not affect call quality. and the person receiving it will see messages on the screen such as “private number,” “unknown,” or similar, but will not have access to your ID.
How does the hidden number work technically?
When you activate Hidden Number Calling mode, your mobile phone sends a signal to the carrier's network indicating that your caller ID should not be displayed to the recipient. The call center processes the call without including your number in the header information, preventing the recipient from knowing who the call is from. This process is automatic and transparent, whether you activate it once or permanently.
Different methods to call with a hidden number on Android
Today, Calling with a hidden number from Android is very simple., and you can do this in several ways, depending on whether you want your number to remain hidden for all calls or just for a specific one. We'll explain the options in detail:
1. Configuration from the mobile settings
Most Android phones allow Hide your number permanently or until you disable the optionThe steps may vary slightly depending on the brand or customization level of your device, but the process generally follows this structure:
- Open the phone app on your phone (the icon is usually shaped like a phone).
- Access the options menu (usually indicated by three vertical dots in the top right corner or by a gear).
- Go to the “Settings” or “More Settings” section.
- Find and select the “Caller ID,” “Show My Caller ID,” or “Caller ID” option.
- Select "Hide number."
Once activated, All your calls will go out with a hidden number until you disable this option again. If you want to revert it, simply select the "Show Number" option again.
2. Use a code before the destination number
If you only want the number to appear hidden on a specific call, you can use a specific code that is added before the phone number the one you are calling. In Spain, the standard code is # 31 #, while in other countries it may vary.
- Example: To call 612345678 and hide your number, dial # 31 # 612345678 and make the call normally.
This method only applies to the one-time call you're making. For future calls, your number will appear again unless you repeat the process.
- If you save a contact in your address book with the code # 31 # before the number, whenever you call that contact, your number will be automatically hidden. For more information about other secret codes for android, you can check it out.
In some companies, there may be limitations on the use of this code, especially with international calls or according to internal security regulations.
3. Request the hidden number service from the operator
Another option, less common and sometimes requiring a fee, is to ask your telephone company to activate the hidden number service for your line. This way, All outgoing calls will always be made as a hidden number, without having to configure anything on your mobile.
The process usually involves contacting your carrier's customer service and requesting activation. Some carriers allow you to manage this process from the online customer area. Please note that additional terms may apply and, in some cases, may incur an additional cost or require acceptance of certain terms of use.
4. Calling with a hidden number on Internet telephony services
Some services like Google Voice and similar apps also allow you to hide your caller ID. For example, in Google Voice you can activate the anonymous caller ID feature for all calls or just for specific ones by entering the appropriate prefix (in Spain, usually # 31 # before the destination number).
How to call with hidden number from iPhone?
On iPhone, hiding your number is just as easy and the steps are similar:
- Access "Settings" on your iPhone.
- Go to “Phone” and tap “Show Caller ID.”
- Uncheck the box to prevent your number from being displayed on outgoing calls.
You can also use the same code # 31 # to hide your number on specific calls from iPhone.
Is it legal to hide your number on your calls?
The use of hidden numbers is completely legal in Spain. and is regulated by telecommunications regulations. It is designed to protect user privacy and is offered as a standard service by all operators. However, it is important to make a responsible and ethical use, without using this feature to make fraudulent calls, spam, harass, or otherwise violate the rights of others. If you receive annoying calls from hidden numbers, most cell phones allow you to block these types of calls, or you can contact your carrier for assistance.
Advantages and considerations of using the hidden number
- Privacy & Security: Prevent your number from being registered by strangers, companies, or individuals.
- Avoid unwanted callbacks and the possible misuse of your number.
- Useful for specific tasks (second-hand sales, calls to technical services, queries where you do not want to leave a record).
- Reversible at any time: You can easily display your number again in your settings or simply not use the code for one-off calls.
However, you must keep in mind that Some people may reject or not answer calls from hidden numbers For security reasons or due to lack of trust. Additionally, there are services (for example, certain emergency lines or special numbers) where hiding the number is not permitted for legal and traceability reasons.
Frequently Asked Questions About Hidden Numbers on Android
- Can I show my number again after hiding it? Yes, if you hid it in your settings, just select "Show number" again. If you hid it with a prefix, simply don't use it for future calls.
- Does it work in any country? The code method may vary depending on country or carrier regulations. In Spain, the code is #31#, but it's a good idea to check with your carrier if you're calling from or to other countries.
- Can I hide my number on all calls or just some? Both options are possible: permanent from the settings, or one-off using the code for individual calls.
- Can I hide my number on WhatsApp or other messaging apps? No, in apps like WhatsApp, the number is always displayed, as it's the account's primary identifier. Hidden number options only affect traditional voice calls (GSM/3G/4G/5G, VoLTE, etc.).
To remove the hidden number and display your caller ID again, simply go back to your call settings and select "Show Number." If you've been using the code before, simply stop using it. If your carrier has set it permanently, you'll need to contact them to request its deactivation.
As you have seen, Calling with a hidden number on Android is a useful and simple tool., essential for maintaining privacy in certain situations. You can adapt it to your needs: from hiding your number on all calls to doing so only on specific occasions, always safely and legally.
