A new report from comScore highlights the degree to which Americans are using their smartphones. According to data collected for July 2012, there was a total of 150.7 million retail visits to the mobile sites of America?s top retailers. The most visited mobile retailer was Amazon with 49.6 million visits. It was followed by eBay which had 32.6 million retail visits; Apple had 17.7 million. Rounding out the visits was Wal-Mart with 16.3 million visits; Target with 10 million visits and Best Buy with 7.2 million visits.