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How to make your old iphone useful
When you go for your upgrade, make it clear to the salesperson in the store that you want to keep your old phone.
Some stores may pressure you to trade it in or recycle it. But your old iphone is worth a lot more than you can be offered.
Go to settings, general, and about, and change name from your current to something else, such as your name followed by " old. " this way, under icloud, you will have a way to distinguish the devices.