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To avoid "too good to be true" scams or faulty hardware, follow this essential inspection guide:
Look for "screen burn" (ghostly images) on AMOLED displays and check for dead pixels by viewing a solid white or black image. Inspect the charging port for loose connections.
New phones lose roughly 20–30% of their value the moment they are unboxed. Buying used means the previous owner has already absorbed that initial loss. Key Checklist Before You Buy
Many manufacturers have built-in diagnostic menus (e.g., Samsung's *#0*# ) to test speakers, vibration, and sensors.