Q: I’m using a Square credit card reader that attaches to my smartphone, but I’m finding that the transactions don’t always go through properly. Is there a certain smartphone or cellular service ...

Square’s free credit card reader works with the free Square Point of Sale (POS) app. You can use it to accept swipe payments on your Apple device. Image: Square Pros and cons. Pros ...

Discover the best credit card readers. Compare top picks, pricing, ... Square Terminal: Best overall card reader/smart terminal. Image: Square Logo. Our rating: 4.79 out of 5.