Used iPhone: what you need to know before buying one
It's more common than you think: buying a used iPhone has been a growing practice around the world. Users prefer to buy refurbished iPhones not only because they spend a lot less, but also because they want to contribute to a more sustainable planet.
The truth is that there are more and more options on the market, which proves that the experience of buying such a smartphone is very positive. Still, it's important to check the device's condition before you buy it. There are some factors you should consider that should weigh on your decision.
Used iPhone: what to do before buying one
First of all, it's important to know where you are buying the used iPhone—online or in a physical store. Wherever it is, you must ensure that the entity is trustworthy and that they are not selling you something that either does not exist or is not in the advertised condition.
Knowing where to buy a refurbished iPhone is, therefore, the most important step in such a purchase—especially since there are stores that perform rigorous quality tests (like ISELL), but there are others that do not invest in such verification.
With this, we want to tell you that you should ensure that the used iPhone is in perfect condition, both in terms of software and hardware, before buying it.
But there are other aspects you should consider.

The battery
Don't be afraid to ask the seller questions, because it's very important that you do. Ask them about the condition of the battery of the device, as this is one of the Apple components with the shortest lifespan and that wears out most easily.
The screen
Turn on the iPhone and test it as much as you can. Use the screen, open different applications, and write in the notes app. It is essential that you test the display, its response time, and whether it is, therefore, working as it should.
Speakers and microphone
Often forgotten, the speakers and microphone of a used iPhone need to be in perfect working order. It is always useful to ask the seller to play music and make recordings using the device's native software.
Test as many features as possible, ask the seller about the condition of the accessories, and ensure the iPhone is in excellent condition before buying it. Also, ask about the device's warranty period.
Happy shopping!