Square’s mobile readers are headed to select T-Mobile retail locations Tuesday, and just in time for campaign season. The Square mobile reader — a smartphone accessory with a card reader that you can plug into the headphone jack of most iPhones, iPads and Android devices — will be sold in T-Mobile stores starting Tuesday. The attachments, which are already sold in Apple stores and other retailers such as Target and Best Buy, make it possible to process credit cards via smartphone. That ability has become increasingly important for merchants who have historically run on a cash-only basis, such as food carts or farmer’s market vendors. Read full article > >

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Square readers coming to T-Mobile stores