Apple designs products to be durable and provide leading-edge device software update support. This makes the iPhone last longer than other smartphones, and given that iPhones aren't cheap, buying a second-hand iPhone is also a great way to own an iPhone.
If you're buying a second-hand iPhone online, Apple's official advice:
1. Buy from reliable sellers;
2. Understand the return policy. Make sure you understand how long you must return your iPhone (if necessary), why you can do it, and how;
3. Find out if the seller has certified their used equipment and what the certification process requires;
4. If you can, find out if the iPhone has any physical damage, the health of the battery, and the parts and repair history of the iPhone;
5. If the iPhone is in the activation lock state, please do not purchase it;
6. Check your iPhone after receiving it.
After buying or buying in a physical store, you should check the physical condition of your iPhone, is it working properly? As well as knowing the health of the battery.
First of all, check your phone for damage, severe damage may affect the functionality of your iPhone. Remove the case and all accessories from the iPhone, check the display for scratches; whether there are scratches, scuffs and dents on the side and back of the phone; Whether the charging connector is damaged or debris.
When you unlock your iPhone and see the home screen, you can start testing something.
If you see a "Hello" screen (including "Hello" in various languages), it means that your iPhone has been factory reset. At this point, you can set it and check the details of the internal software functions.
When entering the iPhone setting interface smoothly, if the iPhone has been locked, it means that the previous owner of the iPhone has not completely erased the previous data, or there is a problem with the source of the iPhone, it is recommended not to buy such an iPhone.
Before testing each function, you can confirm whether the iPhone has a maintenance record, in iOS 15.2 and later versions, you can go to "Settings" > "General" > "About" to confirm the phone serial number, production date, use date and other information.
You may see Parts and Service History after the serial number. If a part is marked as "Genuine Apple Part," the part has been replaced with a genuine Apple Part using the Genuine Apple Part and process. If a part is marked as "Unknown Part", it means that the installation is incomplete, or the part has been replaced with a non-genuine part, has been used or installed in another iPhone before, or does not work as expected.
With this method, users can also check the health of the battery and whether the phone is locked to the carrier. In addition, it is necessary to check whether the mobile phone can be connected to WiFi, whether the mobile phone buttons can be used normally, the status of the camera, speaker, microphone, display, etc.