Screen and orifice detection
Look carefully at whether there are traces on the screen, and whether there is dust on the data cable, earphone hole and speaker hole.
Fuselage inspection
Look carefully at the battery card, mini sd card and sim card lock of the fuselage for dial marks, rotation marks on the shafts of the upper and lower covers, and indentations on the two protrusions of the upper cover.
Call record detection
Check carefully whether the call time is recorded.
Shell detection
Shell contrast (contrast proves that good machines, such as brightness, uniformity, color tone, granularity ...). Smell the smell, the new machine has sandalwood smell, which is different from ordinary detergent and perfume. There must be no sticky wax and oil on the fuselage (if there is, it has been beautified by JS).
Contact point detection
Carefully check the contact points of the body SIM card, mini sd card and battery for wear marks (distinguish other contact points).
Interface detection
Check whether the gap at the shell joint is even and below 1MM, whether there are prying marks, and whether there are scratches and used marks on the infrared port and usb interface.
Key and display screen detection
Compare the elasticity of keys and the brightness of internal and external display screens with the new machine.
Trademark inspection
Look carefully at the fixed gong nail of the fuselage for rotary printing, painting and inking (you can use a magnifying glass) and prying marks on the trademark.