You can check it through the following points:

1. Check carefully whether there are any marks on the screen; whether there is dust on the data cable, headphone hole, speaker hole, strap hole, etc.

2. Check carefully whether there are scratches on the battery lock of the fuselage, and whether there are any rotation marks on the rotating shafts of the upper and lower covers.

3. Carefully check whether there are records in the WAP and voice functions and the call record information function.

4. Smell the smell. The new machine has a special sandalwood smell that will not dissipate in a short period of time after purchase. This smell is different from the smell of general detergents and perfumes, and is also different from plastics or chemicals. Smell (PS: Check the fuselage carefully to see if there is sticky wax and oil, and the nails are slightly scratched. If there is any, it means it has been beautified by the merchant).

5. Carefully check the contact points of the SIM card and the battery contact point of the fuselage to see if there are any wear marks. The new machine will be as shiny as frosted.

6. Check whether the gaps at the seams of the shell are even and small, whether there are pry marks, and whether there are pick marks at the two sealing points under the screen inside the upper cover.

7. The keys of the new machine are very elastic, the physical keys have strong feedback, and the volume keys on the left are only slightly loose or not loose at all.

8. Look carefully at the fixing nails of the fuselage for signs of rotation, friction, paint or ink (you can use a magnifying glass), and for signs of prying marks or scratches on the trademark.

9. Check whether there are scratches on the film. New machines are all integrated with the film. There will definitely be no bubbles in the original film. Although JS's film technology may be very high, this must be checked.

10. The overall appearance is coordinated, and the shell is bright without any scratches.