Spam, commercial, and fraudulent calls have become so insistent that they interrupt meals, naps, and meetings. If you're fed up with ringing salespeople, robocalls, and scamsHere's a comprehensive guide with real-world, proven methods to stop them on iPhone, Android, and landlines.
In addition to blocking on the phone itself, there are operator tools, quick codes, devices for landlines, and ad exclusion lists. We also review the legal framework in Spain, how to report and what risks there are when responding., so you can choose the combination of measures that best suits your daily routine without missing important calls.
What do we mean by spam calls?
A spam call is any unsolicited telephone communication with commercial or criminal intent. From telemarketing campaigns to scams, robocalls and impersonations, everything comes in here., where the real number is masked to appear reliable.
Usual modalities
- Insistent telemarketing: sales of products or services you did not order, often from unknown or toll-free lines.
- Robocalls and Autodialers: canned responses or initial silences due to mass dialing systems.
- Spoofing: The scammer pretends to be a reliable company or contact to extract information or money.
- Tax fraud and fake technical support: intimidation with alleged debts or viruses and urgency to pay or grant access.
- AI and Voice Cloning Scams: synthetic voices that imitate family members or employees to trick you into a fictitious emergency.
Why do you get so many spam calls?
The cause is often inadvertent consent, data leaks, and listing fraud. Cybercriminals buy numbers in bulk and try their luck on a large scale., marking thousands at a time with prepared scripts.
- Registrations on dubious websites or sweepstakes: may end up in the hands of third parties for advertising purposes.
- Data leaks and reselling: If a company suffers a breach, your number could end up on the dark web.
- Number inheritance: If your phone belonged to someone else, you could drag along their spam history.
A rule of thumb: If you don't recognize the number, let it go to voicemail and check it later. Answering increases the likelihood of further attempts and opens the door to social engineering techniques..
What the law says and how to leave commercial bases
In Spain, the General Telecommunications Law, amended in 2022 and fully in force since 2023, restricts unsolicited commercial calls without consent. Cold calling is limited, but there are exceptions (for example, if there is a current contract) and does not by itself prevent spam from dishonest actors.
The AEPD recommends several measures to reduce commercial harassment. They are simple and effective, especially if you organize well with your suppliers.:
- Sign up for the Robinson List: After two months, companies without your permission should not call you to sell.
- Revoke previous consents: ask them to stop using your number for advertising purposes.
- Exercise opposition or suppression: that they do not use your data for marketing or that they delete it when appropriate.
If you live in other countries, look up the appropriate "Do Not Call" registry (in the US, the National Do Not Call Registry). These lists reduce legitimate marketing, although they do not stop scammers..
Proven methods to block calls on iPhone, Android, and landlines
iPhone: Block numbers and silence unknown callers
To isolate specific numbers, just a few taps on Phone are all it takes. You will block both calls, SMS and FaceTime from that contact.:
- Open Phone and go to Recents, Contacts, Favorites, or Voicemail, depending on where you see the number. Tap the “i” icon next to the register.
- Swipe down and choose block this contact to stop receiving calls and messages.
If the harassment is persistent, you can “Silence Unknown Callers” in Settings > Phone. This sends to inbox anything that is not in your contacts or history, although they will still appear in Recents and you will be able to leave a message.
Note: The iPhone also allows calls from contacts saved in apps like WhatsApp. Consider this option if you don't want to miss provider alerts, messaging, or medical notifications..
Android: Native spam identifier and filter
In the Phone app (Google Dialer) there is a very effective filtering that is usually activated. The system displays alerts and can block suspicious numbers before they ring.:
- Open Phone and enter the three-dot menu. Go to Settings and search Caller ID and spam o Call and spam filter.
- Active View spam identifier and notifications and if you want to lock automatically, enable Filter spam calls.
When filtering is set to "maximum," dialed calls will not ring or appear as missed; they will remain in your call history or voicemail. Please note that to identify and filter, Android sends metadata of unknown calls to Google (doesn't share your calendar), which allows for improved detections; for more context, see Google Messages and Android AI.
Reports and exceptions
Has a number slipped through the net or has a legitimate contact been dialed incorrectly? You can mark as spam or correct false positives with "Not Spam" from RecentsThis way, you help the system fine-tune the database and avoid future errors.
Pixel and automatic filtering
On the Pixel 6 and later, basic automatic filtering is built in; on the Pixel 5 and earlier, there's a "silent rejection" mode for spam. On models with Automatic Call Filtering you won't see the "Filter spam" option because it's already included..
Samsung: Smart Call
On Samsung phones running One UI 1.1 or later, Smart Call identifies and blocks or labels potential fraudsters. Detection combines data from Samsung and Google services:
- Open Phone, press the three dots button and enter Settings > block numbers.
- Active Block calls from strangers and adjust spam alerts.
Its effectiveness may vary depending on region, operator and connectivity. If it fails, clear cache/data of the Phone app or check for a system update..
Quick codes that can save your afternoon
Many operators allow you to activate filters from the dialer with short combinations. They work mainly on landlines and, in some cases, on mobile phones.:
- * 77: Activate blocking of calls without ID (hidden/private). To deactivate, it is usually * 87. Consult your operator.
- *61 (AT&T and similar): Add the last incoming number to the block (limit of entries according to plan). For other fixed-line operators, the equivalent service may be *60 or #01#.
- #662# (T-Mobile): Enable Scam Block at the network level; to disable, check # 632 #Suspicious calls neither ring nor are marked as missed.
These codes vary by country and operator. Always confirm with your company what combinations are available on your line..
What your carrier offers (and you're not using)
Most providers have extra layers of blocking with machine learning. When you activate them in the operator's app or in your account, you will see warnings such as "Spam Risk" or "Probable Scam.":
T-Mobile Scam Shield
- Install and access the T-Mobile app and activate Scam Shield. Adjust block lists and preferences. You can also activate by network with #662# or get help by dialing 611.
The free version identifies and blocks calls with constant updates; the premium version allows custom lists and more control.
AT&T ActiveArmor
- Download AT&T ActiveArmor, turn on spam and fraud protection and customize whether to block, allow, or send to inbox. Higher plans add Enhanced ID and Number Lookup.
Verizon Call Filter
- Install Verizon Call Filter, log in and activate free basic protection; if you need more, there's a paid plan. On landlines, Residential Call Blocking filters out robocalls and spam..
UScellular Call Guardian
- With Call Guardian You can block high risk on the free plan, and on the premium plan, have detailed ID, custom lists, and block all annoyances by category.
Third-party apps: a plus when native isn't enough
Solutions like Truecaller, Hiya, RoboKiller, and Nomorobo are powered by large databases with real-time reporting. Identify, label, and block suspicious calls with advanced filters:
- Install a reputable app from the App Store or Google Play and verify your number if requested. Grant permissions (contacts and call log) for it to work.
- Activate in your settings the automatic lock of spam, custom lists and notifications.
- Hiya: real-time alerts and advanced blocking, including international ones.
- RoboKiller: uses AI-powered answering machines to “distract” spammers and break their cycle.
- Nomorobo: filter with CAPTCHA-type “human test” and support for VoIP landlines as well as mobile phones.
Before installing, research reviews and the company responsible; if you can, Scan the app with your mobile antivirus to hunt for strange behavior.
Landlines: Physical jammers that work
On landlines you can add a device that filters for you. Some come with pre-loaded lists of malicious numbers and dedicated buttons to add new ones.:
- CPR Call Blocker: blocks known fraudulent numbers and allows you to add your own from a landline or VoIP.
- Sentry Call Blockers: They act as "access control" by requesting verification before passing the call.
Installation is usually as simple as inserting the device into the VoIP outlet or terminal and following the manual. Make sure it's compatible with your network and includes robocall, telemarketing, and spam blocking..
Report spam to break the chain
If you're in the U.S., the FTC investigates and prosecutes patterns in your reports. The more information you provide, the better the future actions and detections will be.:
- Go to the FTC's reporting portal and click Report Now.
- Fill out the form with details (number, reason given, date/time).
- Send and save the acknowledgment. You can also call 1-877-FTC-HELP.
In Spain, document dates, numbers and voice messages, and Report to your operator and, if applicable, to the AEPD or consumer when there is advertising treatment without legal basis or aggressive practices.
Additional tricks and fine-tuning
Android: Block hidden numbers
If you're being called from a "private number," go to Blocked Numbers in Google Phone and turn on "Unknown Numbers." Keep in mind that you may miss useful calls that hide the ID..
Whitelists and voice alerts
Whitelists prevent false positives: authorizes critical contacts or groups (family, doctor, bank) and block the rest by categories. If you prefer, activate identifier ads so that the mobile phone "sings" who is calling.
Share or verify the identifier
Android allows you to suggest and confirm company names to improve identification. From Recents, look for the options "Was this a business?" or "Identifying comments" and send your contribution.
For businesses and VoIP switchboards
In VoIP systems you can block by number, pattern, country or IP. Create routing rules that either terminate the call or redirect it to an informative announcement (email, web, or email).
- Define sources to block (lists or patterns) in your control panel.
- Generates an incoming rule that "blocks group calls" hang up or forward to a message.
If you receive "ghost calls" on IP phones, limit incoming calls to known sources, Check SIP user and change the default port 5060 to stop scans.
Alternative number and privacy: less exposure, less spam
A secondary virtual number separates your private life from registrations and subscriptions. Services like Surfshark's Alternative Number forward calls and SMS to its app.; if it gets filled with spam, you pause it or generate another one.
It is a paid add-on to a cybersecurity package with VPN and identity tools, and even data deletion services in corridors to request the deletion of your data from their databases.
Risks of answering spam calls
Answering is not always harmless: you may incur costs (especially if there are international forwarding), confirm that the number is active and exposing yourself to voice recordings that are later reused.
- Identity Theft: Pretending to be an organization or technical support, they seek financial data or credentials.
- Account access: Phishing techniques over the phone to reset passwords or obtain 2FA codes.
The less you interact, the better. Avoid saying "yes" clearly, don't identify yourself and never dictate codes that come to you by SMS.
News and local scenarios: AI apps and commercial limits
In Spain, NO ESpam has emerged, an iPhone app that uses automatic learning to detect patterns and block calls, with a database fed by user reports and custom whitelistsIf you're only on Android, rely on Google's filter or reputable apps for the time being.
Authorities have strengthened limits on telemarketing and, according to the measures discussed, the use of 800/900 numbers for support and attention due to its traceability. Remember: if you have a current contract, the company may call you regarding service issues. The legal framework reduces invasive marketing, but does not eliminate international fraud on its own..
And what about the "counterattack" without legal problems?
If you don't want to report yet, play defense with technology: Activate automatic filters, IVR type "press X to continue" and mailboxes with voice "captcha". Robots fail to make it through these steps, and spam plummets.
Another option is to use "anti-spam" answering apps like RoboKiller to waste spammers' timeAnd always report to the provider: many blocks are applied at the network level after sufficient warning.
With a smart combination of phone settings, carrier services, exclusion lists, and a reliable app, spam noise is reduced to manageable levels. By prioritizing whitelists, automatic filters, and an alternate number for registrations, you'll keep your main line clean and safe., without missing calls that really matter. Share this guide and more users will know about the topic..