Why do Apple exchange iPhones with out purchases receipts?

My dad broke his iPhone 5 screen and took it to one of the apple shop and they exchange

Why do they do that with out the purchases receipts

There are several reasons

1. Customer service
2. They can tell who the phone is registered to through the phone system
3. They make such a huge profit on every phone they can afford to be generous
4. They don't care if the phone is stolen, and many people have had Apple unlock stolen phones so they can use them.

Because the necessary proof of purchase is already on their system.

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