How to Use a Phone As a Credit Card Terminal. If you have a smartphone -- be it an iPhone or an Android-powered phone -- you can use a portable card reader to take credit card payments anywhere ...

Square recently released an improved, redesigned card reader. Current Square users will need to request a new one.

Tap your phone on the reader at the cash register, and like magic, you’re done. The charge will be processed using the debit or credit card you entered into your digital wallet.

Utilizing a microSD memory card adapter as needed, you can use these external readers to transfer data to and from your microSD card.

Learn how to use Square to accept credit card payments in person or online. Step-by-step guide for setup, hardware, invoices and more.

Businesses accept credit cards by choosing a processor, setting up a business bank account and selecting payment hardware like POS systems or mobile readers.

Thousands of Christian churches across the world are now using portable card readers or apps to take donations as people increasingly stop carrying cash on them.