1. Check whether the packaging of the mobile phone is old, and then carefully check whether there are scratches or uneven paint on the appearance of the mobile phone.
2. Check whether the serial number of the mobile phone is consistent with the warranty card, whether it is guaranteed nationwide, whether there is a formal invoice, and whether there is a "network access license" issued by the Ministry of Information Industry (there are no parallel imports and knockoffs).
3. Test run is required. Check whether there is any problem inside the mobile phone after startup (mainly check whether there is any bright spot on the display screen of the mobile phone, and finally count the accessories. If there is no problem, you can rest assured to buy! ! !