A $20 credit card can get you the new iPhone 5s, 6S, 6s Plus, or 7 for less than $100.
But the device can be used to buy items at online stores, such as Best Buy and Walmart, for as little as $15.
The process is fairly simple: You fill out a credit or debit card application on the Amazon website and enter your phone number, expiration date, and phone number plus the $20 in your card.
You then scan the credit or card reader and pay for the item you want.
The credit card doesn’t need to be able to handle credit card payments, and it only has to work for credit cards in the United States.
The same process can be done with Amazon’s Kindle Fire tablets, too.