The latest Orange Device Sales data from Orange Switzerland show the iPhone 5S as the best-selling smartphone at Orange Centers in the first quarter of the year, followed by the Samsung Galaxy S4 and iPhone 4s 8GB, Telecompaper.com reported on Thursday, and noting that more than 90 percent of post-paid smartphones Orange sold are 4G/LTE-enabled. The top-sellers in the pre-paid market were Nokia 206, Nokia 108, and Alcatel Idol Mini, with smartphones now accounting for 50 percent of all pre-paid mobile devices sold.