How to Prepare an Apple Watch for Sale
Erasing an Apple Watch is not the same as properly unpairing it and removing Activation Lock. Prepare both the watch and its account association before a handover.
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Record the series, size and connectivity
Identify the generation, case size and GPS or GPS + Cellular version. Describe the case material, display condition and battery performance. List the band and charging cable you intend to include.
Unpair using the official Apple checklist
When you still have the paired iPhone, use Apple's instructions for unpairing the watch. Apple's checklist explains account-password confirmation and Activation Lock removal. Do not share your password with the buyer.
If you no longer have the paired iPhone, use the alternative process in Apple's guide. Simply erasing the watch without removing its account association may leave Activation Lock in place.
Address your cellular plan separately
For cellular watches, follow Apple's guidance about removing the plan and contact your carrier about cancellation or transfer where required. Device reset and a carrier billing change are separate steps.
Check condition and accessories
Describe cracked glass, charging failures, damaged buttons or poor battery life. Keep a record of condition and the included band and charger. Wait for the quote response and agreed handover instructions before shipping.