Regional trade agreements HS code mapping

Second-hand iPhone inspection skills: reveal the inspection steps and Regional trade agreements HS code mappingprecautions for you. Buying a second-hand iPhone has always been a troublesome thing. Many people buy cheap ones It takes a long time to compare second-hand iPhones, but I just don't know if it's a really good mobile phone.If you are also looking for a second-hand iPhone, you need to know the inspection skills to judge the quality of the mobile phone. I. Tools required for machine inspection. In order to test the machine, the following tools need to be prepared: 1. USB data cable 2. Charger 3. Computer 4. Second-hand iPhone II, inspection steps The key to successful inspection is the clear steps. Next, let's learn about the common inspection steps: 1. Appearance inspection. The appearance inspection of the second-hand iPhone is very important. We need to check whether the mobile phone is bumped, faded, and cracked on the screen. If the appearance is not good, the price of the mobile phone will be greatly reduced. In addition, you should also pay attention to hearing, touch, etc., and shake your mobile phone to see if it is loose or abnormal. Two. It is very important to charge and check the power of a second-hand iPhone. When checking the power, you canCheck by connecting the charger. If the battery of the mobile phone is very old or there are some problems, it will definitely heat up at this time. 3. The most important thing in screen inspection is the screen inspection. Before that, you need to enable screen debugging, open "Settings", enter "General", then enter "About Mobile Phone", find "Version Number" and click 7 times to start screen debugging. Check whether the screen is normal through screen debugging. Four. Network inspection In order to ensure the high value of second-hand iPhones, we need to check whether the network connection is smooth. Wi-Fi and Bluetooth connections are very suitable for this kind of inspection. To test whether the function is normal, you can check the signal strength when connecting the device. It must be stable and fast. 5. Microphones and headphones need to be checked in the inspection.To check whether the microphone and headphones are normal, these are input and output functions, which can be tested as needed. When checking, you can test the microphone by recording a few segments of voice, or use headphones to listen to music or voice input. 6. Sensor inspection is in the inspection, and it is also very important to check the sensor function. You need to test the gravity sensor, light sensor and distance sensor, etc. to make sure that they all work properly and have no problems. Things to pay attention to when inspecting the machine: 1. Don't be in a hurry to buy a second-hand iPhone. If you want to buy a second-hand iPhone, don't be in a hurry to buy it. Even if it is a good-looking mobile phone, there may be some problems. We need to pay special attention during inspection to avoid such problems. Two. Pay attention to the color of the screen. When inspecting the machine, you need to pay special attention to whether the screen color is normal. If the color is abnormal, it means that there may be some problems inside the mobile phone, and it is better not to buy it.3. Check the phone and text message functions. When checking the machine, you need to check whether the phone and text message functions are normal, because these are the core functions of second-hand iPhones. Summary: The above are the skills of second-hand iPhone inspection. The steps of inspection are very simple. As long as you follow the above steps, you can complete the inspection smoothly. When inspecting the machine, we need to pay special attention to whether the appearance, charging, screen, network, microphone and sensor are normal. If you can inspect the machine in the above way, you can buy a better second-hand iPhone.

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