subsidized prices. Custom Branded Device Program Sprint Corporation offered its MVNOs a program called the "Custom Branded Device Program", which gave MVNOs access to completely unbranded Android smartphones with no references to Sprint that the MVNO could then customize with its own branded apps and services through Sprint's Mobile ID and Mobile Zone products. Though these phones were free of Sprint branding, they were certified to run on Sprint networks. Data roaming agreements On May 9, 2006, Sprint Nextel and Alltel agreed on a new Nationwide Roaming partnership. It was reciprocal, and gave Alltel customers access to the Sprint 1x and EV-DO network and Sprint customers access to Alltel's denser, rural 1x and EV-DO voice and data network. The roaming reciprocity agreement between Alltel and Sprint was set to expire in 2016. Sprint and Verizon Wireless had a reciprocal data roaming agreement that allowed for the use of Sprint Power Vision content like TV, movie downloads, and stream radio in Verizon 1x and EVDO coverage areas. Sprint also had a reciprocal 1xRTT, EVDO and LTE data and voice roaming agreement with U.S. Cellular. Sprint had an LTE roaming agreement with AT&T as well, which was typically limited to 3G speeds. Several cases of Sprint phones simultaneously roaming on Verizon's CDMA network for voice and AT&T's LTE network for data were observed in 2017. In 2018, with the announcement of the Sprint and T-Mobile merger, Sprint gained access to roaming on T-Mobile's LTE network for 4 years. Roaming on T-Mobile was counted as native data usage and had no speed restrictions. Wireless networks The following is a list of known CDMA, LTE, and NR frequencies which Sprint employed in the United States: CDMA Sprint operated a nationwide CDMA network in the 1.9 GHz PCS band. In 2006, Sprint's EV-DO "Power Vision" network reached more than 190 million people. Sprint then continued to upgrade their 3G EV-DO network until it reached 260 million people in 2007. Sprint eventually covered over 300 million PoPs with EV-DO services. Sprint added eHRPD to its network (EV-DO routed through an LTE core network) in order to facilitate smooth handoffs between LTE and EV-DO. As a result of the Merger with T-Mobile US, Sprint's CDMA network was completely shut down on May 31, 2022. LTE On July 28, 2011, Sprint announced that it had decided to end its rollout of the 4G network using WiMAX technology, in