Getting calls from a private or unknown number and not sure what to do? You are not alone. In Israel, thousands of people receive unidentified calls every single day. Some are completely harmless and some are deeply unsettling. But before you decide how to respond, it is worth understanding that these two types of calls are fundamentally different from each other:
- With a private caller, the person calling made a deliberate choice to hide their identity.
- With an unknown caller, the number simply was not transmitted to the network, usually for a technical reason.
- The difference between the two determines what you can do and how you can protect yourself.
- Traceback is the Israeli app that helps you reveal who is hiding behind a private number.
What is a private caller?
When your screen displays "Private" or "Hidden number," the person calling you took a deliberate action to conceal their identity. This is not a glitch. It is a choice. They either dialed a special prefix before your number (in Israel, #31# is commonly used before the number) or they configured their phone to permanently hide their number through their carrier's settings.
All major Israeli carriers, Partner, Cellcom, Pelephone, Hot Mobile, Golan and Rami Levi, allow their subscribers to hide their number. This is a legitimate service with entirely innocent uses. A doctor calling from a personal phone, a lawyer, or simply someone who prefers privacy. But it is also the tool used by harassers, scammers and people who are trying to avoid accountability.
What characterizes calls from a private number?
- The caller knows who you are but you have no idea who they are.
- The call comes through perfectly normally from a technical standpoint.
- You cannot call the number back.
- If the calls repeat themselves, it is almost always intentional.
What is an unknown caller?
An unknown caller is an entirely different situation. Here, the number simply was not transmitted to the network. Not because someone hid it but because of a technical limitation. This typically happens with international calls routed through certain systems, calls from business switchboards that mask internal extensions, or when there is a compatibility issue between two telecom networks.
In Israel, caller ID display for local calls is officially described as "not guaranteed" even by the telecom providers themselves. Incoming international calls frequently suffer from this issue as well. The result is that your phone displays "Unknown" not because someone is hiding but simply because the information never arrived.
What characterizes calls from an unknown number?
- Usually the result of a technical issue and not intentional concealment.
- International calls are the most common cause.
- Large business switchboards like banks, health funds and government bodies can also appear as "unknown."
- A single unknown call is usually harmless but repeated ones deserve your attention.
The practical difference and why it matters to you
The distinction between a private caller and an unknown caller is not just academic. It has direct practical implications for how you respond and how you protect yourself.
| Criteria | Private caller | Unknown caller |
|---|---|---|
| Intent | Deliberate and active | Usually technical |
| Who is calling | A specific person hiding themselves | Usually a business or international source |
| Potential risk | Higher if repeated | Lower for a single call |
| Can it be revealed? | Yes, with Traceback | More limited |
When someone calls you from a private number repeatedly, that is a conscious decision. Every time they hit dial they are choosing again to remain anonymous to you while knowing exactly who you are. That imbalance is precisely what needs to be addressed.
How Traceback helps you reveal a private number
Traceback was built specifically for this situation. The Israeli app works with all carriers, Partner, Cellcom, Pelephone, Hot Mobile, Golan and Rami Levi, and lets you reveal the real number behind a private call.
How does it work? Traceback works directly with Israel's cellular networks to retrieve the actual caller number even when it has been hidden. This is not a guess and it is not an external database. It is direct access to the network data itself.
Pricing: 13₪ per week, 22.90₪ per month or 225₪ per year. Traceback is available on iOS and Android and offers:
- Real-time identification of private numbers
- Detailed call history with timestamps
- Report export that is especially useful if you are considering going to the police
- Support for all Israeli carriers
What to do when you receive a private or unknown call
If you are receiving calls from a private or unknown number and feel uncomfortable, here are the recommended steps:
- Do not rush to answer. If it is important, they will leave a voicemail.
- Document the call. Time, date and frequency. Every detail may matter later on.
- Use Traceback. Find out who is hiding behind the private number before deciding what to do.
- If the calls are repeated and harassing, contact the police by dialing 100 with the documentation you have gathered.
- If it involves financial fraud, contact your bank immediately and the National Cyber Directorate by dialing 119.
Frequently asked questions about private and unknown callers
Can I block calls from private numbers?
Yes, but with limitations. On iOS you can enable "Silence Unknown Callers" via Settings, then Phone, then Silence Unknown Callers. Android has a similar option in the call settings. The problem is that a blanket block will also silence legitimate unidentified calls like your doctor or your bank. The smarter approach is to reveal the number first with Traceback and then decide whether to block it.
Is hiding your number legal in Israel?
Yes. Number hiding is a legitimate service offered by all Israeli carriers to their subscribers. However, using a hidden number to harass, threaten or defraud someone is a criminal offense under Israel's Privacy Protection Law and Computer Law. Revealing the number with Traceback and approaching the authorities with documented evidence is the right way to handle it.
How is Traceback different from other caller ID apps?
Most caller ID apps like Truecaller work from crowd-sourced databases built on user reports. They can identify numbers that have been reported before but they cannot reveal a genuinely hidden private number. Traceback works directly with Israel's cellular networks and is capable of revealing the real number even when the caller has hidden it. That is a capability no other app in Israel currently offers.