The Risks of Sharing Your Phone Number in a Vehicle Listing

The first half hour after publishing your vehicle listing can mark the beginning of a period when your phone works harder than at any other time in your life. Some callers genuinely want to come for a test drive; others say they want to send a deposit without even seeing a photo of the vehicle. As someone who has been watching this market for over thirty years, let me say this: the number you put in the listing is both the most functional and the most exposed part of the sales process. In the past, listings were printed on paper and hung in newspapers for two weeks; now your number can reach databases, call center lists, and worse, within minutes. In this article, I will address the risks that come with exposing your number, the legal framework, and practical ways to protect yourself.

How Long Does Your Number Remain Valid Information in a Listing?

A phone number is personal data under KVKK (Law No. 6698); just like a full name, address, or T.C. identity number. A seller publishing their own number in a listing is a choice based on consent, so it does not constitute a crime. The problem is that this data slips out of control after the listing: everyone who sees the number copies it with a screenshot, adds it to a list, and passes it on to others.

This is where the law comes into play. Giving or spreading someone's phone number to third parties without their consent is a crime under Article 136 of the Turkish Penal Code, and the penalty is imprisonment from 2 to 4 years. According to the established case law of the Court of Cassation, the fact that the information is known to everyone does not change its nature as personal data. Moreover, this crime is not dependent on a complaint; the prosecutor's office can open an investigation on its own. In short, as a seller, the misuse of your number is not an empty concern but a concrete right protected by law.

What Pitfalls Should You Watch Out for in Calls After a Listing?

Persistent deposit demands and fake buyer scenarios

The best-known pitfall of the second-hand market is deposit fraud. The classic scenario works like this: the caller says they like the vehicle without even haggling, and wants to send a deposit right away to establish a claim on the vehicle. The goal is usually to get your account number or to lure you into a fake payment flow. With the revival of the second-hand market, official warnings about fake listings and deposit fraudsters asking for account numbers have also increased. Viewed from a legal perspective, if deposit fraud carries the elements of aggravated fraud, it can result in imprisonment from 3 to 10 years and a judicial fine of up to 5,000 days.

The precursor step of this scenario is the reconnaissance call: the person acting like a buyer asks about the model year, mileage, and damage status; the real goal is not the car itself, but getting to know the seller. In complaint records, there are sellers who have encountered fake government official calls and persistent down payment requests after posting their listing. Similarly, user discussions are quite widespread about buyers who raise suspicion by asking for the number and then never making contact; this suggests that the purpose of collecting the number has nothing to do with the sale.

Fake secure payment links and the single "hello" trap

The second trap is called the fake secure payment link. The person acting like a buyer says the payment will be made through the platform's secure system and sends a link to your phone. As soon as you enter that link, your card and bank details can be stolen. The critical detail to know here is this: the real secure payment systems used in used car sales cover the full sale price, not down payments. A payment confirmation for a down payment should not be considered secure, even if it arrives as an SMS on your phone. Not sharing IBAN details by phone or SMS should also be a seller's basic rule.

The third risk is newer and more insidious. Scammers can reach you through hard-to-trace lines; in the silent call method, even a single "hello" can start the fraud chain. That short conversation, from which a voice recording is taken, can become material for AI-powered voice imitation. In the past, the purpose of a caller hiding their number was clear, and you would hang up; now the risk extends as far as your number being recorded while you talk. As your number passes into databases, the flow of commercial calls and SMS also grows; while this bombardment is not itself fraud, it tires out the seller and gives fake calls a chance to hide among genuine ones.

How Do Listing Platforms Protect Your Number?

The largest listing platform in Türkiye has been offering a service it calls the temporary number since March 2015. The person viewing the listing cannot see or learn your real number; however, when they call, they are instantly connected to your phone. The second way to prevent the full number from being displayed is in the account settings: by turning off the option to send messages, communication can be ensured to take place only through the platform. The registered mobile number can be changed from the account information; it is also possible to update contact details after the listing.

The effectiveness of these protections is not beyond debate. User forums contain opinions discussing that the temporary number provides security but questioning how well it works; buyers who ask for the number and then disappear are still at the top of the suspicion list. Some users also state that there is no clear and explicit approval step in number sharing, and that the system needs to be reviewed. In other words, platform protection is certainly valuable, but it should not be counted as a security policy on its own.

Another major platform does not enter the table, because there is no documented hidden number feature there; the standout option on that side is the dealership sales service conducted with a TSE-certified inspection report. This leads to a practical conclusion: a seller who never wants to reveal their number should seriously consider the sale or trade-in options of car dealerships, which today appear to be the most natural route.

What Precautions Should Be Taken Before a Listing Goes Live?

The list of precautions is short and actionable. First, decide which channel you will share your number through: is the platform's temporary number service enabled, or are your messaging settings turned off? Second, review the listing text; personal information must be completely removed from the listing text. Third, remember the platform's official safety principles: sellers are never asked for credit or bank card information, suspicious accounts and links are not trusted, and calls from the platform must be distinguished from unidentified calls.

If your number has ended up in databases, the official way to stop unwanted commercial communication is the Commercial Electronic Message Management System, accessible through e-Devlet. Through IYS you can manage your contact addresses, view which brands have commercial message approval, and request removal from the database. Options are also available on the device and carrier side: while carriers' reject-hidden-number feature automatically blocks unidentified calls, a phone's call filtering settings and the caller ID and spam protection functions of security software make it possible to screen unknown numbers. For most sellers, setting up existing settings correctly is a sufficient starting point, rather than opening a new line; that is the extent of the documentable methods, and the rest is a matter of habit.

What Should Be the First Step If a Suspicious Call Comes In?

First, let's clarify this: publishing your number on a listing is not a crime; the legal risk concerns third parties sharing your number without permission and the misuse of that data. This distinction is the first thing a seller who has lost confidence because of being victimized needs to know. If a suspicious call comes in, collect evidence such as a screenshot, call log, and date and time information without panicking. Do not let unknown numbers speak first; do not share any information without verifying the identity of a person who introduces themselves as a government official, bank employee, or buyer.

The next steps follow in order: reporting the situation to the listing platform, filing a criminal complaint with the Chief Public Prosecutor's Office if necessary, applying to the KVKK if there is a personal data breach, and considering the path to compensation for both material and moral damages. In cases of fraud victimization, it is emphasized that a complaint should be filed without wasting time; since number sharing is already an offense not dependent on a complaint, the prosecution process can also proceed on its own. If you paid money, contact your bank and the platform without any delay; every minute lost cools the money trail.

Won't the Sale Go Through Without Sharing the Number? A Balanced Answer

So, after all this, are we obligated to share our number? The balanced answer is this: making first contact with the buyer by phone speeds up the sale and increases the chance of finding the right buyer; hiding the number completely can slow down communication. But there is a wide space between hiding and exposing, and that space is filled precisely by the measures described in this article: a temporary number service, no personal information in the listing text, staying closed to deposit and link requests, and setting up IYS and operator settings correctly.

The rule I have learned most over the years is this: a real buyer asks for photos of the car, a fake buyer asks for your account number. Take a step back with every request for a deposit; secure payment systems work not for deposits, but for the full sale price. Verify every call you are suspicious of through the platform. A seller who is this cautious will find both evidence and clear avenues to pursue even if their number is exposed. Selling a car is already tiring enough work; don't burden every call coming to your phone with the risk of becoming a court case.

Sources

• Is Sharing a Phone Number Without Permission a Crime?
• Sharing a Phone Number
• Temporary Number
• Safety Tips
• Sahibinden.com temporary number service
• Deposit Fraud Crime and Its Penalty
• Beware of fake listings in the used car market
• Commercial Electronic Message Management System
• Reject hidden numbers (ACR)
• Protect Yourself from Fraud
• I Was Scammed on Sahibinden, What Should I Do?