Whether you’re in the market for the super-slim new iPhone Air or planning to go big with the iPhone 17 Pro Max, don’t just toss that old phone in a drawer when you upgrade. We’ve compared some popular options for trading in an old device. The last thing to do before you run off to cash in your old phone is to back up all your data using iCloud. Best for Reliable CashCourtesy of Gazelle Gazelle Trade-In Program Shop at GazelleGazelle is the old hand in the world of used phones. A 128-GB unlocked iPhone 15 in lightly used condition will net you about $315.