: A rising favorite for unlocked models . They guarantee a battery health of 90% or higher, which is stricter than many other third-party competitors. Retailer Comparison Table (2026) Typical Savings Battery Guarantee Apple 100% (New Battery) Amazon Renewed 80%+ (90%+ Premium) 90 Days – 1 Year Back Market plug 90%+ Gazelle Crucial Pre-Purchase Checklist

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: A dedicated marketplace that vets independent refurbishers. It often has the deepest discounts , with models like the iPhone 15 (256GB) priced around $419 compared to higher prices elsewhere. Warranty : 1-year limited warranty.