"The Samsung Galaxy S4 smartphone went on sale the last week of April across 327 networks in 155 countries. The GS4 is reported to be flying off the shelves and is the top-selling phone at 57% of the stores that are carrying the consumer favorite. In fact, the closest smartphone in the sales race is Samsung?s own Galaxy S3, the predecessor to the new model, with Apple Inc.?s (NASDAQ: AAPL) iPhone in third place.."