If you do not know, then yes there is Sim Card Slots included in Verizon iPhone 6 and iPhone 6 Plus. You can insert Nano Sims. Even in previous generation devices like iPhone 5, iPhone 5c and iPhone 5s, SIM cards were included that were connected to the Verizon Wireless network. By this feature, it becomes possible to connect the device to high data speed that means LTE network (4G).
Voice over LTE (VoLTE) features will also be included in iPhone 6 and iPhone 6 Plus. As a Verizon customer, you will be able to use data and do voice calling. The HD voice calling is possible to any other compatible devices as well.