It has been six years since Apple introduced the original iPhone. The event was likened to a seismic shift that ignited the push to adopt smartphones in the United States. Now with up to 70 percent of subscribers owning smartphones, the big three carriers are searching for ways to encourage upgrades.
However, the push comes as consumers complain the 'wow' factor is missing from the industry. The slowdown in smartphone upgrades - evident in Samsung and Apple's sales - fell nine percent in 2012 with 68 million U.S. subscribers upgrading their devices, according to a Wednesday Wall Street Journal report...