Grade A/A+:
The phone looks like new or almost. The battery is 82% or over on iPhones. Usually, no scratches on the screen and housing but can sometimes have 1 scratch of less than 3 mm somewhere on the phone.
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Grade AB:
The phone shows moderate signs of use, with typically no scratches on the screen or at most one light scratch under 5mm. The housing generally has light wear. The battery is at 82% or higher for iPhones."
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Grade B:
The phone shows moderate signs of use. The screen may have a few scratches, usually less than 10mm. The housing generally exhibits some wear. The battery is at 82% or higher for iPhones. If there are no significant signs of wear, the phone may have light burn-in on the screen.
See pictures/videos for a better idea
Grade C:
The phone may show major signs of use. If there are no major signs of use, it may have a strong burned-in image. The battery is at 82% or higher on iPhones. The screen can have heavy scratches, and the housing will generally exhibit noticeable wear.
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