AT&T Shut Down Its 2G Network On Jan. 1

Yes, but CDMA is different. With GSM, UMTS was an upgrade path for both voice and data. However, EvDO only accommodates data--voice service still works on CDMA 1x. So, the only way Verizon can retire CDMA is when they can get everyone on VoLTE. I've heard that this should happen around 2020. Persona;;y, I think it'll be possible a few years earlier than that. I can't remember the last time I haven't been on LTE, although that may vary in other areas. Once the network is ready, it'll then be a matter of getting people to adopt LTE phones that can do VoLTE.