The best time to sell is roughly one month before a new model launches. For iPhones, this usually means August. Once the new keynote happens, the trade-in value of older models typically drops by 15–25%.
Inspected, repaired, and often backed by a warranty (e.g., Apple Certified Refurbished or Back Market). buy and sell cell phones
Are you looking to a specific model right now, or are you in the market to buy a new one? The best time to sell is roughly one