More than 10% of Starbucks' US transactions are made with a phone

"Once a coffee shop, now a café, Starbucks is also catching the attention of younger generations with its technology capabilities. Starbucks’s Chief Digital Officer, Adam Brotman, was the first to speak on the conference call following Mr. Schultz, indicating his increasingly important role at the global company.
Mr. Brotman said Starbucks passed the 4-million-follower mark on Twitter earlier this month, and now more than 10% of its transactions in the U.S. are made with a phone. Starbucks’s loyalty cards in North America booked 30% year-over-year growth in dollars loaded. And Starbucks is installing wireless charging mats in more stores, its next big step in technological advancement."

Source:  WSJ, 26th July 2013