How to tell the truth when buying second-hand apples 5s in 58 cities?

1, the first is unpacking. Don't open the machine after unpacking. Shake it to see if there is a loud noise and if the buttons are loose. Then look at whether the paint has fallen off the fuselage, then look at whether the camera has got dust, and take a closer look at the details of each mobile phone.

2. Boot activation (if this machine is booted directly into the phone interface, it means it is second-hand). When booting from the white apple, take some time to have a rough look at whether there are obvious bright spots or bad spots on the screen.

3. In the last step of activation, you can choose not to send an error report. After the boot is activated, first try whether the touch screen is smooth and the camera function is good, then go to "Settings-General-Local" to check the serial number and log in to the website to check the activation time (if it is activated on the 28th today, it may be displayed as 26th and 27th on the website, which is normal, because the server is in the United States, and sometimes the time difference will be poor).

4. Dial a number to see if the call quality is good, if there is any noise or sonic boom, and then the screen will turn black when you listen to the phone. The purpose of this trip is to test the sensor. If it doesn't turn black, there is something wrong with the sensor. 5. Turn off the phone and connect to WIFI, log on to a website with picture wallpaper at will, and find some black and white pictures to observe carefully. Black mainly depends on bright spots and bad spots, while white mainly depends on whether the overall tone of the screen is consistent. If it is not the same, it means that it is a screen of yin and yang. When checking the screen, remember to turn the screen to the brightest. At the same time, keep the WIFI connection, and go to several networks casually to see if the WIFI will be interrupted.

6. As for the "cold screen and warm screen", you really don't have to care too much. As long as there is no light leakage, you can look comfortable.