1GB = 1 billion bytes and 1TB = 1 trillion bytes; actual formatted capacity less.
** Trade-in values vary based on the condition, year and configuration of your trade-in device, and may also vary between online and in-store trade-in. You must be at least 18 years old. In-store trade-in requires presentation of a valid photo ID. Additional terms from Apple or Apple’s trade-in partners may apply.