What is the safest way to inspect a second-hand iPhone?
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Using second-hand mobile phones is indeed a socially effective choice. In addition to being cost-effective, it also reduces the pollution of electronic products to the environment. However, we must avoid being deceived, otherwise we will suffer some unnecessary losses. Let's take a look at the specific situation. 1. Whether there is iCloud activation lock When buying a second-hand iPhone, you should confirm whether the iPhone has iCloud activation lock through Apple's official website. If there is an activation lock, first, it is impossible to confirm whether the seller is the owner of the phone, and second, the iPhone may be remotely locked and completely unusable one day in the future. 2. Check the serial number Use Apple's official website or third-party tools such as Apple Fan Query to confirm some important information of the iPhone serial number, such as activation time, remaining warranty period, etc. The serial number of the iPhone is determined by the motherboard, but scammers on the market may tamper with the serial number, so we still need to perform the third step. 3. DFU flashing After getting a second-hand iPhone, it is recommended that Fengyou use DFU mode to flash the phone. You can tell whether it is a demon phone at a glance. The demon phone may have the following situations during the DFU recovery process: 1. An error code appears and cannot be restored. 2. It cannot be activated after the flashing is completed. 3. The flashing process is in the "white apple" interface for a long time and cannot proceed to the next step. 4. Hardware Inspection Finally, we need to inspect the hardware of the second-hand iPhone. First, we need to judge whether the machine, condition, appearance, color, etc. are the same as the description in the picture, check whether the feel of the iPhone is as good as the genuine one, whether the mesh cover of the earpiece and speaker is woven mesh, and then check whether the touch of the power button, volume button, mute button, and Home button is sensitive and the feedback is obvious and not stiff, and check whether the camera has dust or cracks. Then, we need to turn on the phone for the next step of inspection: Screen inspection method: Download some pure white, pure black, pure green, and pure red wallpapers, adjust the brightness to the maximum to see if the phone has uneven backlight and bad pixels, tilt it to see the viewing angle, whether there is obvious light leakage at the edge, etc. - Is Touch ID normal: Whether the fingerprint recognition function is recorded smoothly and the recognition is sensitive, try to record it once and unlock it multiple times to know. - Is Wi-Fi normal: Check whether the Wi-Fi connection is normal and stable, signal strength, etc. - Is the gyroscope normal: Open the native compass program and you will know. - Is the camera focus available: You can try taking photos, macro, etc. iPhone 6 has phase focus. You can also use your palm to test whether the camera automatically switches between close and long distances quickly. - Is the earphone normal: Try to insert the earphone to see if it is smooth. If the earphone jack cannot be used, it may be that the motherboard is damaged. - Is the distance sensor normal: When making a call, test whether the screen will turn off and be sensitive once the earpiece is covered. You will know it with a try. - Is the flash normal: Open the camera, switch to video recording mode and choose to turn on the flash. Note that you should also observe whether the cold and warm LED flashes of some models work normally at the same time. You will know it with a try. - Is the Bluetooth normal: iPhone can only match other Bluetooth devices but cannot search for other iPhones. Take a Bluetooth headset to re-match and connect. You will know it with a try. - Is the microphone normal: Open the voice memo program that comes with the system and you will know it with a recording. - Is the vibration function normal: Lightly tap the mute button on the side of the phone and you will know it with a try. - Is there a network lock: Turn off data roaming in cellular data. The built-in card reader may not be able to access the Internet after it is turned off. - Whether the device has been disassembled: This needs to be judged by disassembling the device. It mainly depends on whether the internal water test paper is intact, whether there are obvious signs of motherboard repair or "flying wire" welding, etc. - Accessories: If the second-hand iPhone comes with accessories, you need to check whether the serial number in the power adapter is clear, whether the printed font is consistent with the original font, and whether the copper sheet of the data cable interface is neat and has no burrs or corrosion marks.As a winner of Toutiao's Qingyun Plan and Baijiahao's Bai+ Plan, the 2019 Baidu Digital Author of the Year, the Baijiahao's Most Popular Author in the Technology Field, the 2019 Sogou Technology and Culture Author, and the 2021 Baijiahao Quarterly Influential Creator, he has won many awards, including the 2013 Sohu Best Industry Media Person, the 2015 China New Media Entrepreneurship Competition Beijing Third Place, the 2015 Guangmang Experience Award, the 2015 China New Media Entrepreneurship Competition Finals Third Place, and the 2018 Baidu Dynamic Annual Powerful Celebrity. |
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