CDMA is no longer activated on new contracts/devices, and the CDMA network is planned to be shut down by next year (December 31, 2020).
Verizon is now LTE (GSM/3GPP)-based.
https://forum.pine64.org/showthread.php?tid=9150
https://wiki.pine64.org/index.php/PinePhone_APN_Settings#Ver...
Some Librem 5 users suggest activating the Verizon SIM card in an Android phone or iPhone, and then moving the activated SIM card to the Librem 5:
https://www.reddit.com/r/Purism/comments/cjjcdv/well_librem_...
GSM-based networks still seem to be the more reliable option for Linux phones, but it's good to see that Verizon might also be compatible with some effort.
CDMA is no longer activated on new contracts/devices, and the CDMA network is planned to be shut down by next year (December 31, 2020).
Verizon is now LTE (GSM/3GPP)-based.