When you pay for the inspection, first make sure that the mobile phone box you get is sealed. There is usually a trademark seal or the like. Make sure the seal is intact before you open it. Then, after turning it on, check the appearance of the machine to see if there are any scratches, peeling paint, etc. If there are no problems, install the battery and check the machine. Press all the buttons once and make sure the touch screen is sensitive. Then call to make sure the handset and microphone are OK. In fact, there is usually no problem. After making sure there is no problem, let him fill out the warranty card.