A reader, Billie, writes in, “I got free a ‘card-reader’ stick. Don’t know how to use it. When I plug it into a port, nothing comes up to show it is there.” Card readers are typically small USB ...

Opinions expressed by Entrepreneur contributors are their own. The race to dominate the mobile transactions space has been in full swing for awhile, with payments companies clamoring to serve ...

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Modern smartphones can do just about anything, but not many people know how easily they can replace those old cash registers and allow your store to accept credit and debit cards instantly. All you ...

Editorial Note: We earn a commission from partner links on Forbes Advisor. Commissions do not affect our editors' opinions or evaluations. Many credit card readers work with Android devices, but not ...