The first Verizon Wireless smartphones to run voice calls exclusively over the 4G LTE network won't hit the market until the first half of 2016. That's according to Verizon Chief Financial Officer Fran Shammo, speaking to Wall Street at an investor conference on Tuesday. Shammo said the company plans to begin offering voice calls over its LTE network toward the end of the year, which promises potentially higher audio quality and features such as a cloud-based video address book. Even with the transition, Verizon will continue to rely on its 3G network for additional coverage. Verizon, like the other carriers, splits up its wireless traffic, ferrying data such as streaming video and emails over its faster 4G network, while delivering its voice calls over its slower but more reliable and widespread 3G CDMA network.