Anonymous harassment calls: how to deal with them and report them

There's a world of difference between the umpteenth pushy telemarketer and what you may be going through: repeated calls, at any hour, from a hidden number, where someone breathes, insults, threatens or simply hangs up. That's not spam — it's harassment, and it's fought differently. The good news is you're not as defenceless as it feels: even though you can't see the number, the network knows exactly who's calling, and there's a concrete path to stopping it. Let's go step by step — no hot air, no miracle apps.

How do I know it's harassment and not something else?

First, rule out the innocent explanations, because they exist and they're common:

• Occasional hidden calls during business hours are usually hospitals, government offices or company switchboards. It's the most common case, and we cover it in calls from a hidden number: who's calling me?.
• Calls where nobody speaks and the line drops quickly are, very often, call-centre auto-dialers. Annoying, but not personal; it has its own article: silent calls: they call and say nothing.

Harassment has a different pattern: repetition, intent and effect. Insistent calls at unsociable hours; someone who stays silent listening to you, insults you or makes threats; calls that spike after a personal conflict. If they're making you change your habits, switch off your phone or feel afraid, treat it as harassment and keep reading.

What do I do when the call comes in?

Rule number one: don't give them what they're after. A phone harasser feeds on your reaction — your shouting, pleading, insults, or the sound of you rattled. Without a reaction, the game loses its fun.

• Don't answer if you suspect who it is, or answer with a neutral "hello?" and, if nobody speaks or the insults start, hang up without another word. No reproaches, no threats of reporting them: silence and hang up.
• Never give out information: not your name, not whether you're home, not who lives with you. With a hidden number, it's the caller who has to identify themselves first.
• Don't try to "get even" or rise to the bait. Any escalation wears you down and complicates a future report.

Staying calm isn't resignation: it's step one of a strategy. The next steps are the ones that actually corner the harasser.

Why is documenting the calls so important?

Because in a phone harassment case, your log is the evidence. A report that says "they call me a lot" is weak; a report with a dated list of forty calls is a different story. Starting today, write down:

• Date and time of every call (your phone's call log does this for you; take screenshots regularly).
• Duration and what happened: silence, breathing, insults, threats, music.
• What was said, in the most literal words you can remember — especially if there were threats.
• Context: if the calls coincide with a recent conflict (a break-up, a dismissal, a dispute with a neighbour), note that too.

This log serves double duty: it's the backbone of your police report, and it lets your carrier and investigators cross-reference your notes against the network records — where the hidden number does appear.

What can my carrier do?

More than most people think. When someone calls with a hidden number, the network doesn't lose that information: the withholding only stops the number being shown to you, but it stays logged in the carrier's systems.

Call your carrier's customer service and explain that you're receiving harassing calls. Ask about two things:

1. Malicious call identification. Carriers in most countries offer mechanisms to trace the origin of harassing calls, even hidden ones. The service's name and conditions vary from company to company, so ask directly about their procedure for malicious or harassing calls.
2. Blocking hidden calls on your line. Many carriers can reject unidentified calls at network level, especially on landlines.

An honest heads-up: the carrier is not going to tell you who's calling. Communications privacy protects the caller too, and the identification is only released to the competent authority once a police report or formal request is in place. Which is why the next step isn't optional: without a report, that door stays shut.

When and how do I report it?

Report it if there are threats (against you or your family), if the harassment is sustained, or if the calls cause you genuine fear or disrupt your daily life. Phone harassment can be a criminal offence in most countries, and you don't need to wait for it to escalate.

The process is simpler than it feels:

1. Go to your local police station (or use your police force's online reporting channel, where one exists) with your ID and your call log — the screenshots and notes from the previous section.
2. Explain the full pattern: since when, how often, what they say, and whether you suspect someone specific. Well-founded suspicions help steer the investigation, but they're not required: you can report against an unknown person.
3. With the report filed, the authorities can require your carrier to identify the origin of the calls. This is where "hidden number" stops protecting the harasser.

Keep a copy of the report: you'll also need it with your carrier to activate their tracing mechanisms.

How do I protect myself in the meantime?

The investigation takes time, but your peace of mind can't wait:

• Silence or block hidden calls on your mobile: iPhone and Android both support it natively, and on landlines your provider offers it. The exact steps — and when it's not a good idea to switch it on — are in calls from a hidden number: who's calling me?.
• Let voicemail work for you: with hidden calls silenced, a harasser who leaves voice messages is gifting you evidence.
• Don't publish your number on social media, listings or public profiles while the situation lasts, and ask the people around you not to share it.
• Guard your nights: turn on a night-time "do not disturb" mode that lets only your contacts through, and you'll sleep undisturbed without switching your phone off.

And if the harassment comes from a visible number? Then you have the advantage: look it up in the spam number directory in case it's already flagged, keep it as evidence (don't delete it from your call log), block it and report it so there's a public record. A visible number is also far easier to trace in a police investigation.

Frequently asked questions

Can I find out who's calling me from a hidden number with some app? No. If the number is withheld, your phone never receives it and no app can display it. Only the carrier can identify the origin — and they'll only release it to the authorities once a report has been filed.

Can I record the calls as evidence? Recording laws vary by country (and sometimes by state or region): in many places you may record a conversation you're part of; in others, everyone on the call must consent. Check the rules where you live — where it's allowed, a recording of threats can back up your report; mention it when you file.

What if I suspect who it is but can't prove it? Report it anyway and share your suspicion. Proving it isn't your job: the carrier's records can confirm or rule that person out.

How many calls does it take for it to count as harassment? There's no magic number: what counts is the repetition, the intent and the effect on you. Where there are threats, a single call already justifies reporting.

In short

Anonymous harassment calls are designed to make you feel powerless, but the harasser's anonymity is more fragile than they think: the network logs every call, hidden or not. Your plan has four legs: don't react, document everything, activate your carrier, and go to the police when there are threats or a sustained pattern. In the meantime, silence hidden calls and take your peace of mind back.

And for the numbers that do show themselves, the community is your best radar: check any suspicious phone number in NoCall's spam number directory and, if it's bothering or harassing you, report it. Every warning protects the next person.