Mobile payments are the next frontier of retail technology. New products and services that let consumers pay for products using a smartphone instead of a bank card or cash are emerging...More mobile payment options are on the way. Isis, a joint venture from AT&T Mobility, T-Mobile USA, and Verizon Wireless will launch mobile payment trials this summer. Meanwhile, The Wall Street Journal recently reported that Target, Wal-Mart, and other retailers are working on a competing mobile payment system.