What to Find Out Before the Meeting

Before going anywhere, ask the seller to send you the phone's IMEI number. A reasonable seller should have no problem doing this, since the IMEI itself does not give an attacker any meaningful way to compromise the device. Refusing to provide the IMEI before the meeting is a good enough reason not to waste your time on the offer. It is also worth asking in advance whether the original box and receipt are available, whether the phone has ever been repaired, whether the screen or battery has been replaced, and whether the device is tied to a particular carrier. You can then verify these answers against the actual condition of the phone. Any discrepancy between what the seller says and what you find is a more important warning sign than the answer itself.

Digital Verification Using the IMEI

The IMEI number can be displayed by dialing *#06#, and it can also be found on the SIM tray, in the device settings, and on the original box. The first thing you should do at the meeting is compare the number in every available location. If the number shown by the system does not match the one on the device or packaging, it may indicate that the phone has been tampered with, and you should end the deal immediately. Modern smartphones with dual SIM or eSIM support can have two IMEI numbers, so both should be checked. Next, check the IMEI against the Ukrainian Ministry of Internal Affairs' database of stolen phones. This can be done for free through the official service on the e-Ukraine portal by entering the fourteen- or fifteen-digit number without any additional symbols. The check takes only a few seconds and is especially important when the seller has no box, no receipt, and no clear purchase history.

For Apple devices, there is also an official coverage-check page that uses the serial number to show warranty status and activation information. The activation date can help you determine the actual age of the device. If the seller says the phone is one year old but it was activated three years ago, that is another clear discrepancy between words and facts. There are also third-party services that can generate more detailed IMEI reports, including information about carrier locks, blacklist status, and possible signs that the device has been refurbished. Some of these services charge a fee, and for an expensive purchase, spending a small amount on a report can be reasonable. However, these services do not replace the basic check against the official government database.

The Most Important Check of All

A phone that is still linked to its previous owner's account is the one problem that cannot be fixed after the purchase. On an iPhone, this is handled through Find My, which is linked to the owner's Apple Account. If it remains active, the device cannot be properly used without the previous owner's password. On Android, a similar mechanism works through the Google Account and can be triggered after a factory reset. That is why the key requirement for the seller is simple: the phone must be completely removed from the previous owner's account and reset to factory settings before you hand over any money. The seller should perform this in your presence. Checking the result is straightforward. After the reset, the phone should boot to the initial setup screen. If it asks for the password of someone else's account, the device is locked. Promises that the seller will send you the password later are meaningless.

There are no legitimate shortcuts here. Services promising to bypass these locks either do not work or may be part of a separate scam.

Inspecting the Body and Screen

After the digital checks comes the physical inspection. A clean IMEI tells you nothing about whether the phone has been dropped, exposed to moisture, or had its screen replaced. Inspect the body under good lighting, paying attention to uneven gaps between the frame and screen, signs of opening around the screws, deformed corners, and loose buttons. Check the display for uniformity by showing a full-screen white background, then black, followed by several solid colors. This makes dead pixels, pressure marks, and burn-in on OLED displays much easier to spot. A replacement screen can sometimes reveal itself through poorer color quality, different touch response around the edges, or missing features. On iPhones, the system may also explicitly report an unknown part in the hardware settings. Check whether the battery is swollen by gently pressing around the center of the display and inspecting the phone from the side. A raised screen or an uneven body can indicate a swollen battery. A phone in this condition should not be purchased because of the potential safety risk.

Functional Testing

It is worth going through this section as a checklist, because it is easy to forget half of the tests during a conversation with the seller. Test all cameras, including the front-facing and ultra-wide cameras, by taking photos and recording a short video. Test the speakers by playing music at high volume, and test the earpiece by making a phone call. Check the microphones by recording your voice and playing it back.

Test the charging port by connecting a cable and making sure the phone actually charges and that the connector does not move excessively. Check the wireless connections by connecting to Wi-Fi, turning on Bluetooth, and inserting your own SIM card to make sure cellular service works. Test the sensors, including automatic screen rotation, the proximity sensor that turns the screen off when you hold the phone to your ear, automatic brightness, and the compass. Check the fingerprint scanner or face recognition by registering your own fingerprint or face right there during the meeting. Finally, test every physical button, including the volume controls and the mute switch where applicable.

Battery Health

On an iPhone, maximum battery capacity relative to a new battery is shown in the battery settings. A figure below eighty percent generally means that a replacement will likely be needed relatively soon, so this should be reflected in the price. On Android, a built-in battery-health indicator is not always available. In that case, you may need to rely on indirect signs, such as how quickly the battery drains during your testing and information available through service menus, which vary by manufacturer. A replaced battery is not necessarily a problem if the replacement is genuine and properly installed. However, on an iPhone, a non-genuine battery may cause the battery-health reading to disappear and trigger a system notification about an unknown part.

Signs That Mean You Should Simply Walk Away

The seller refuses to provide the IMEI or serial number before the meeting. The IMEI numbers shown in the system, on the SIM tray, and on the box do not match. The phone appears in a stolen-device database or has a blacklist status. The seller wants you to pay before resetting the device and promises to remove the account later. The phone is brought to the meeting already configured for another user, and the seller refuses to reset it in front of you. The price is significantly below market value without a convincing explanation. In this segment, an unusually good deal almost always has a hidden downside.

The seller insists on an advance payment or pushes you to meet somewhere inconvenient or unsafe. This kind of pressure is a classic tactic designed to make you skip part of the verification process.

The Meeting Itself

Meet in a public, well-lit place with access to a power outlet. A shopping mall is much better suited for this than a courtyard or someone's car. Bring your own SIM card, a charging cable, headphones if the phone has a compatible port, and a SIM-eject tool or paper clip. Do not rush. A legitimate seller understands that a buyer needs to inspect an expensive device. Pressure tactics such as "I don't have much time" are often specifically designed to make you skip some of the checks. Paying in cash during an in-person meeting, after completing all the checks, remains one of the safer options. If the transaction takes place remotely, use the marketplace's official secure-payment service rather than following links sent by the seller through third-party messengers.

What to Do After the Purchase

Immediately sign in with your own account and enable the device's Find My or equivalent device-tracking feature so that it is protected if you lose it. Check that no previous owner's profiles, subscriptions, or restrictions remain by reviewing the account settings. Save the phone's IMEI and serial number somewhere separate from the device. You may need them if the phone is ever stolen and you need to report it to the police. As for transferring data from your old phone to the new one, there is one particularly important detail: two-factor authentication apps do not always transfer automatically, so make sure you have restored access to them before wiping your old device.