suspicious, commercial and outright fraudulent calls They've become commonplace: unknown numbers, strange area codes, automated systems that hang up after the first ring, or supposed banks trying to get your information. They're not just annoying; they can also be dangerous if you fall for a phone scam.
The good news is that your phone isn't defenseless: both Android and iPhone have Tools to automatically identify, filter, and block these types of callsAnd you can also strengthen protection with specialized apps like Google Messages and AI and some good security habits. Let's see, step by step, how to make your phone as secure as possible without giving up the calls that really matter to you.
Why it's worth automatically blocking suspicious calls
Before we delve into menus and settings, it's worth understanding why this is such a good idea. Configure your mobile phone to handle a large portion of the spam calls on its own., without you having to be on the lookout every time it rings.
To begin with, we'll talk about Protect your privacy and your personal dataLimiting calls to known contacts, or at least filtering those that look like spam, greatly reduces exposure to aggressive telemarketing and scams that try to extract sensitive information by impersonating your bank, your operator, or the government.
There is also a well-being component: reduce noise, stress and interruptions during the dayHaving your phone constantly ring with insurance offers, surveys, or fake job opportunities can be exhausting. If you automatically filter out much of that noise, it's easier to focus on your tasks and know that when it does ring, there's a much greater chance it's something important.
Finally, the legal aspect helps, but it doesn't solve everything. Although the General Telecommunications Law in Spain requires express consent to be contacted for commercial purposesMany companies don't strictly adhere to it, and others operate from outside the system. That's why, even if you register with services like the Robinson List, you'll still receive unsolicited calls. Hence the importance of combining exclusion lists, mobile settings, and common sense.
What are spam calls, fraud, and vishing?
When we talk about telephone spam, we're not just referring to the typical telemarketing call to sell you a rate or insuranceBehind them could be anything from perfectly legal call centers to networks that are outright trying to scam you.
Spam calls are usually mass campaigns carried out with automated systems They dial numbers randomly or from purchased databases. These can be surveys, promotions, service offers, or even robocalls that leave you hanging after the first ring to check if your number is active.
The most dangerous terrain enters the vishinga type of telephone fraud in which the attacker impersonates banks, operators, electricity companies or even public bodiesThey want you to give them codes, keys, card details or information that they can then use to empty your account or contract services in your name.
Many of these calls originate from data that you yourself have unknowingly given awaySweepstakes, online forms, dubious apps, or unclear consent forms. This data ends up in telemarketing databases or, in the worst-case scenario, in the hands of less scrupulous third parties.
For all these reasons, it's crucial that your mobile phone is capable of recognize typical spam patterns and display on-screen warnings such as "Possible spam", "Commercial call" or "Suspected spam", so that you know what you're dealing with even before you pick up.
How the Google Phone app identifies and blocks spam
On most current Android phones, especially those that come with set the Google Phone app as the default dialerYou already have a fairly advanced caller ID and spam protection system integrated.
This system works by cross-referencing information from the calls you make and receive with a large database of numbers reported and verified by GoogleWhen someone calls you and their number isn't in your contacts, it's sent to Google's servers to check if it belongs to, for example, a known business or a potential spam number. Important: Google does not access the phone numbers you have saved in your contacts.It only analyzes the numbers you interact with but that aren't in your contacts. It also integrates automatic detection techniques, including Google's anti-fraud AIwhich help identify suspicious patterns in real time.
For all of this to work, the option must be enabled on the device. Caller ID and spamIt's usually enabled by default, but it's worth checking. This function doesn't determine whether your number is displayed or hidden when you make calls; it simply allows the phone to... Show who's calling and warn you if it smells like spam..
The activation process is very simple: just open the Phone app, go to the Settings menu and access the section Caller ID and spamThere you will see the switch to activate or deactivate the option View caller ID and spamwhich is responsible for displaying both company names and potential spam warnings on the screen.
Furthermore, from that same menu you can activate a key function if you want the mobile itself to Block suspicious calls without you having to do anythingThe option to filter spam calls. If you activate it, calls that the system considers spam will be automatically rejected; the phone won't ring and you won't receive a missed call notification, although they will be recorded in your call history and you'll have voicemail messages available in your inbox.
Filter and block spam calls automatically on Android
If you want to go a step further and have the phone do Automatic removal of clearly fraudulent or commercial callsGoogle's spam filter is your best ally, as long as your Android uses the Google Phone app.
To check, open the Phone app, tap the options menu, and then tap on Settings > Caller ID & SpamThere you will find three important levers: View caller ID and spam, Filter spam calls and the configuration of Verified calls from companies, which allows legitimate businesses to display their name and the reason for the call.
When activating Filter spam callsYour Android device will automatically reject most calls that Google categorizes as spam, and on many models, you'll see these calls marked in your call history as filtered or unwanted. The useful thing is that you still have a record in case the system ever makes a mistake and you want to review what was blocked.
The filter isn't foolproof, but it improves every day thanks to reports submitted by millions of users. Every time you mark a number as spam from your call history, You help that number be identified as suspicious to the restTo do this, you just need to tap the call in question and select the option to block or mark as spam.
In parallel, Android offers the possibility of block calls from hidden or private numbersIn the Phone app, under Settings > Blocked numbers, you'll see an option called something like "Unknown," which actually refers to numbers that don't display their identifier (hidden, private, unidentified). If you enable it, any incoming call without a visible number will be automatically blocked, at the cost of potentially missing legitimate calls made with a hidden number.
Other ways to block unwanted calls on Android
Not all manufacturers use the Google Phone app as the default dialer. Brands like Samsung, Xiaomi, and Huawei include its own phone app with built-in filters and blockswhich in many cases allow blocking from specific numbers to ranges of prefixes or international calls.
In most of these layers, the procedure is similar: you open the Phone app, go into the call settings, and look for sections like Call blocking, Blocked numbers, or Call rejectionFrom there you can activate blocking of unknown numbers, manually add numbers to a blacklist, or create rules (for example, blocking all numbers that begin with a certain international prefix).
If your phone has its own dialer but you're interested in using Google's system, you can almost always Install the Google Phone app from the Play Store and set it as the default to take advantage of its spam filter. It's as simple as downloading it, opening it, and, the first time, accepting that it's the default app for calls.
When spam is very aggressive, or if the system tools fall short, you can resort to third-party applications specializing in call identification and blockingAmong the best-known are Truecaller, Hiya, and Mr. Number. These apps typically include features such as shared blacklists, blocking by country, area code, or mass calls, and display who is calling you based on massive user databases.
However, these solutions come with fine print: to work they usually require access to your contact list and your call logThey often add a bit more load to the system. Before installing them, it's worth weighing the balance between the extra protection they offer and the amount of data you're giving up, and considering measures such as block facilities unwished.
How to block suspicious calls on iPhone
In the Apple ecosystem, iOS also includes very useful tools for Keep unwanted calls at bay on iPhoneHowever, the approach is somewhat different from Android and relies heavily on third-party apps for the advanced identification part.
One of the most practical features of iOS is the option to silence calls from unknown numbersWhen activated, any call from a number not in your contacts, not appearing in recent calls, and not having sent you a message before, is sent directly to voicemail and won't ring. You'll be able to see those calls later in your call log, but They won't interrupt you in the moment.
Activation is very straightforward: go to Settings > Phone and enable the option to mute unknown numbers. This way, you'll still receive calls from your contacts and numbers you've already interacted with, but most spam will be blocked.
In addition, iPhone allows manually block specific numbersFrom the Phone app, on the Recents tab, you can tap the information icon for any call and select the option to block that contact. From then on, all future calls from that number will be automatically rejected.
To go further with intelligent filtering, iOS offers the possibility of Integrate call and spam blocking apps downloaded from the App StoreServices like Truecaller or Hiya can be activated in Settings > Phone > Call blocking and identification, so that the system consults its databases when you receive a call and can label it as spam or block it according to the settings you choose.
If what you want is something as radical as limit calls to a very small group of peopleYou can always use the Do Not Disturb feature (or Focus Modes in newer versions). From Settings > Sound or Settings > Focus Modes, you can choose to only receive calls from your favorites, your contacts, or no calls at all, depending on your needs at any given time.
Quick options: blacklists, Do Not Disturb mode, and prefix blocking
Beyond automatic filters, both Android and iPhone allow Use quick strategies to drastically reduce nuisance calls, combining blocking of specific numbers, Do Not Disturb mode and, in some cases, blocking of prefixes or international calls.
Manually blocking a number is the first line of defense: if you see that a number keeps calling you, you can block it directly from the call historyOn Android, you press and hold the number and choose Block or Block/Mark as spam; on iPhone, you go into the call information and tap Block this contact.
Mode Do not bother It's perfect for times when you don't want virtually anyone to call you. On Android, you'll find it in Settings > Sound and vibration > Do not disturb, where you can decide whether to allow calls only from starred contacts, only from your contacts, from no one, or from anyone who calls repeatedly in a short period. On iPhone, in Settings > Do not disturb or Focus Mode, you can set who can break the silence.
For some Android devices with manufacturer skins, you have advanced features for block calls by prefix or from certain countriesThis is useful if you're receiving attacks from international numbers with a clear pattern. Apps like Mr. Number or Truecaller also allow you to create rules of this type, blocking, for example, all numbers that begin with certain digits or all those that don't belong to your country.
If your concern is the calls to premium rate numbers (905, 803, 806, etc.) or premium services, some operators, such as those that offer line management apps like Mi O2, allow you to block these calls and SMS from the application itself, avoiding both fraud and surprises on the bill.
Mark calls as spam and correct false positives
Automatic detection systems rely heavily on the collaboration of users who mark calls as spamEvery time you block or report a suspicious call, you help feed the databases that are then used by both your mobile phone and specialized apps to warn other people.
In the Google Phone app, you can Mark any number from your history as spamSimply tap on the call and select the Block/Mark as spam option. From that moment on, that number will stop bothering you and will also be flagged as suspicious for other users when they receive a similar call.
It's also important to correct errors when the system is overly cautious. If a call from someone you know or a legitimate company is marked as spam, you can to report that it is not From the call log itself: open the call in Recent Calls and select Not spam or unblock the number. This correction helps prevent the number from appearing as suspicious in the future.
In some countries and operators, there is also the figure of the verified callsThis feature allows companies to register and display their real name and, sometimes, the reason for the call before you answer. Enabling this feature (when available in your region) can help you distinguish a legitimate call from your bank from a vishing attempt.
External services: Robinson List and protection platforms
Besides what you can do on your phone, there are external services that help reduce unwanted marketing callsIn Spain, the reference is the Robinson List, an advertising exclusion file that companies must consult before calling.
Signing up for the Robinson List is free and can be done online. Once your number is registered, companies with which you have no prior relationship will be able to block you. They shouldn't call you to offer you products or services.It's not magic or immediate, but over time a significant drop in legitimate telemarketing calls that comply with regulations is usually noticeable.
The problem is that Not all companies comply with these obligations And, of course, scammers simply ignore any exclusion lists. That's why the Robinson List is a good complement, but it doesn't replace properly configuring your mobile phone and maintaining a cautious approach.
On an international level, platforms such as Hiya They work hand in hand with operators and manufacturers (AT&T, Samsung, Virgin Media, O2, etc.) to strengthen call security at the network level. Their goal is to protect both end users and the companies themselves that want to communicate legitimately with their customers from spam and fraud. Some operators also implement their own solutions (for example, Grandma Daisy (from O2) to entertain and detect scammers before they reach the user.
These solutions, often integrated into the operator's network or phone settings, allow block threats even before they reach the deviceadding another layer of security to what Android, iOS and lock apps already do.
Good habits to avoid receiving annoying calls
Beyond technology, your behavior makes the difference. Many problems are avoided by more careful management of your phone numberWhenever you share it in forms, sweepstakes or online registrations, make sure you carefully read the consent boxes related to advertising.
It is highly recommended to review the permissions you grant to applications that you install. Some request access to your phone, contacts, and SMS messages even when it's not necessary for their main function. Refusing these permissions when they're not justified reduces the risk of your number or your contacts' numbers ending up on commercial lists.
When you receive a call that seems suspicious, the wisest thing to do is Do not give out personal information, do not share verification codes, and do not click on automated menu options.If you hang up the call and, if in doubt, call your bank, operator or company's official phone number directly, you will avoid many of the most common scams.
If you also have tools from your operator (such as customer apps like My O2, My Movistar or similar), it's worth checking if they offer Options to block calls to special rate, international or premium numbersBlocking entire categories of paid calls at their root provides an extra layer of security and peace of mind.
With all these measures combined—spam filters, number blocking, exclusion lists, and best practices—it is possible significantly reduce the volume of unwanted calls without giving up receiving the ones that really interest you, whether from your contacts, your trusted bank, or a legitimate job opportunity.
Properly configuring the tools your mobile phone already has, using services like the Robinson List, and acting with a bit of digital savvy means that going from suffering suspicious calls to them becoming just an occasional occurrence is within anyone's reach; it just takes a few minutes to adjust the settings and keep in mind that, if in doubt, it's always best to let your phone filter first and then calmly decide which calls deserve your attention.
