Studies built from the offers mail-in buyers publish on this site, Apple's own trade-in values and the prices local buyers pay. Every number is computed from current data when the site rebuilds, and each study has a CSV you can download and cite.

median gap between the highest and lowest mail-in offer for the same phone, across 124 models and 4 buyers.
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median discount for a carrier-locked phone against the same phone unlocked, across 3,058 matched offers.
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Apple devices where a mail-in buyer’s top offer beats Apple’s own trade-in value.
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