The "unlocked" smartphone market has been growing rapidly across the United States in recent years. It posted a +40% YoY growth during Q1 2018 mainly thanks to strong performance of Motorola and Samsung in this segment. However, coupled with the shift of Apple’s iPhone Upgrade Program, we expect unlocked smartphones market will post an annual decline in 2018. Apple’s iPhone Upgrade Program has proven failed and instead Apple shifted towards more flexible financial offerings for unlocked iPhones. Motorola, Blu and Samsung ranked the top 3 list, followed by Apple, TCL-Alcatel and LG in US unlocked smartphone market during Q1 2018. Our extensive report contains quarterly unlocked smartphone shipments and marketshare for the top 15 vendors in the United States from 2013 through Q1 2018. The report also contains US unlocked smartphone forecasts, as well as unlocked iPhone forecasts from 2012 through 2023. This report is a valuable tool for mobile stakeholders who want to size the fast-growing, high-value unlocked smartphone market in US.