iPhone trade-ins doubled in month leading up to Samsung Galaxy S IV launch March 21, 2013 2:24 PM John Koetsier John Koetsier LinkedIn Twitter Facebook Google Plus Profile Recent Stories: OK, new Flickr, you got me. I’m back. iPhone 5S near? Best Buy offers $50 off iPhone 5 Apple CEO Tim Cook’s employee approval rating dips, but still high in spite of issues Are people trading in their iPhones for Samsung's new Galaxy S IV?