As of July 1, 2018 Verizon is not allowing activation of the CDMA modems in TSC3 data collectors. If you have a TSC3 with Verizon modem already activated it will continue to work on the Verizon network. Verizon is transitioning all devices to their LTE network. As part of this change they will no longer activate CDMA devices. Verizon has stated that they will continue to support existing CDMA devices on their network through December 31st, 2019.
The TSC3 can still be used for Network RTK with a wifi hotspot, this only affects the Verizon internal modem.