I am constantly receiving Amazon gift cards as a thank you from various people, which I love because I know I will be able to redeem them quickly. But sometimes the cards don't have an amount printed ...

In this guide we’ll show you how to quickly redeem an Amazon gift card using your iPhone. If you recently received an Amazon gift card, you can securely redeem it on your iPhone using the Amazon app.

And if you do end up with a scam card, you can file a report with the gift card issuer, though your mileage may vary in terms ...