Buying a new phone, especially premium products like the iPhone, is a top concern for consumers regarding issues such as quality, reliability... The following article will help you feel confident in choosing the phone of your dreams before purchasing.

1. For Newly Purchased iPhones
With a brand-new iPhone, the first step is to check the entire box, the plastic wrap around the box to see if there are any signs of peeling or damage.

Read the information on the label of the box to ensure it's complete and the text is evenly spaced and easy to read. An easily noticeable characteristic is that the text on Apple product boxes appears slightly gray but still legible. Additionally, the box contains information about the product and included accessories. You can use mobile barcode scanning software to check if the product information matches.

Open the box and check if all accessories are included: charger, cable, headphones, user manual, and SIM ejector tool.

Then, power on the device and test its functions to see if they operate smoothly and without issues. The steps to inspect a new iPhone are simply to check if there are any abnormal issues with the appearance or any minor defects.
2. For Used iPhone Models
Buying a used iPhone is a common need for many Apple enthusiasts who love Apple products but don't have the means to purchase new ones.
Step 1: Check the Exterior.
The first important thing you need to check is the exterior of the device. Look for any signs of abnormalities on the phone's casing (scratches, discolored casing, peeling, adhesive residue...). An important note is the engraved text on the back of the phone, which should include details such as Design by Apple in California, Assembled in China along with Model Axxx. The font should be uniform, grayish, slightly faded but still visible.

Step 2: Inspect the SIM slot and physical buttons (power button, volume buttons, mute switch, home button).
Remove the SIM card tray and insert a SIM card to test if the phone detects the SIM and has full signal strength. Additionally, check the responsiveness of the physical buttons on the iPhone such as the power button, volume buttons, and home button by pressing them to see if they are stuck or difficult to press, and if they make a clicking sound when pressed.

Step 3: Check the Software and Functions of the Device (screen, speaker, mic, camera, sensors…)
Turn on the device and test the functionality of the speaker and microphone by making a call to another phone to check if the external speaker and earpiece speaker are clear, and if the microphone captures sound properly. Test other functions such as the fingerprint sensor (for iPhone 5s, 6, 7, 8) to ensure they work properly. Additionally, open the camera app and take test photos to assess photo quality, try touching the screen to focus or move the camera to a dark area to check if the light sensor works well.

Step 4: Check the Screen and Touch Functionality.
Inspect the screen by adjusting the brightness to the highest level to see if there are any color inaccuracies or abnormalities such as screen bleeding or dead pixels. Enable the virtual Home button by navigating to Settings => General => Accessibility => Assistive Touch, then press and hold the virtual Home button to move the entire screen. If the Home button moves smoothly across all positions, we can be confident in the touch screen.

Through this article, we hope readers can confidently inspect and purchase iPhones that meet their preferences. If readers have any questions or additional insights, feel free to ask or comment below the article!