Before a refurbished iPhone is sold by Grest, it goes through a 50+ diagnostic and inspection process designed to check its functionality, battery, software, connectivity, physical condition and more.
The idea is simple: a refurbished iPhone shouldn't be judged only by how it looks. It needs to work properly, pass the relevant checks and be graded clearly before it reaches the customer.
So, what exactly does Grest check?
How Does Grest Test Refurbished iPhones?
Grest's testing process covers multiple parts of the device, from basic functions like charging and calling to more detailed checks for the screen, cameras, sensors, battery and device security.
1. Functionality Checks
The first step is making sure the iPhone's essential functions work properly.
Grest's 50+-point testing process includes checks for:
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Power button and power-on
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Device charging and charging port
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Wi-Fi and Bluetooth
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Cellular connectivity
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GPS and location services
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NFC
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SIM reader and SIM tray
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Calling
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Rotation
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Speakers and volume controls
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Microphone and voice recording
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Vibration
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Mute switch
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Front and rear cameras
These checks help ensure that the phone isn't simply turning on, but that its important everyday functions are working as expected.
2. Screen and Touch Testing
The display is one of the most-used parts of an iPhone, so Grest checks several aspects of the screen.
The inspection includes:
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LCD and display functionality
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Multi-touch
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Digitizer
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Screen pixels
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Screen resolution
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Screen cracks and chips
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Screen lifting
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Screen watermarks
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Screen burn
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Green-frame issues
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3D Touch, where applicable
This is also important for grading the phone's cosmetic condition. A phone can have visible signs of previous use while still having a fully functional screen.
3. Battery Testing
Battery condition is another important part of evaluating a refurbished iPhone.
Grest's listed battery checks include:
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Battery cycle count
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Battery health percentage
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Battery resistance reading
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Full-charge reading
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Battery temperature range
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Power-on and charging checks
This gives Grest measurable information about the battery rather than relying only on whether the phone can hold a charge.
4. iCloud, Software and Security Checks
Before a refurbished iPhone reaches a new owner, it also needs to be properly cleared and ready for use.
Grest checks for:
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iOS activation
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iCloud account removal
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Certified data wiping
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Complete device passcode unlock
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Rooted-device checks
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Jailbroken-device checks
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Manual erase
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Factory reset
The process also includes checks such as device counterfeit verification, clone checks, finance checks and insurance-claim checks.
These checks are particularly important because refurbishment isn't only about repairing or cleaning the physical device. The phone also needs to be appropriately cleared and evaluated before resale.
5. Connectivity and Sensor Checks
An iPhone relies on several components that aren't immediately visible.
Grest's testing process includes checks for Wi-Fi, Bluetooth, cellular connectivity, GPS, NFC and location services, along with sensors such as:
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Accelerometer
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Barometer
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Gyroscope
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Proximity sensor
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Light sensor
Face ID and Touch ID are also included where applicable.
This helps evaluate the smaller components that can make a significant difference to everyday use.
6. Camera and Audio Checks
Cameras, microphones and speakers are also tested.
Grest checks the front-facing camera and rear-camera image capture, along with microphones, video microphone functionality, voice memo recording, speakers and loudspeakers.
So when a refurbished iPhone is evaluated, the inspection goes beyond simply checking whether the camera app opens. Its relevant hardware functions are tested as part of the wider diagnostic process.
7. Physical and Cosmetic Inspection
Once the functional checks are covered, the physical condition of the device is evaluated.
Grest's inspection includes:
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Case bend alignment
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Outer casing
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Ports and jack cosmetics
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SIM tray condition
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Button condition
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Overall casing
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Device camera condition
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Screen condition
This is where the phone's cosmetic grade becomes important.
Grest categorises refurbished iPhones into Superb, Good and Fair, giving customers a clearer idea of what the device may look like before purchasing it.
A Superb device has minimal visible signs of use, while a Good device can have noticeable scratches or blemishes. Fair devices can have more visible marks, dents and scratches, while the screen remains intact.
Why Does Grest Use 50+ Quality Checks?
A refurbished iPhone can have many individual components that need to work together. Checking only the screen, battery or camera wouldn't give a complete picture of the device.
Grest's 50-point process brings these checks together across functionality, software, connectivity, battery, sensors, cameras, display and physical condition.
The result is a more detailed evaluation of each device before it is graded and offered for sale.
What Happens After the iPhone Is Tested?
After the inspection and diagnostic process, the device's condition is evaluated and it is assigned a Grest grade: Superb, Good or Fair.
This means the grade is not simply a description of how the phone looks. It is part of a broader inspection process that evaluates the device's working condition as well as its cosmetic appearance.
If you're looking for a refurbished iPhone that has gone through this testing and grading process, you can explore the available models in Grest's refurbished iPhone collection.
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