GordonThree wrote:
Most Verizon sites are GSM now, they have largely retired cdma. Sprint is a carrier with a large cdma network still operating.
verizon and ATT still aren't compatible networks and hence aren't letting one roam on the other network. there are many places where only ATT or verizon get us a signal, not both. However if someone has sprint coverage, I usually get verizon coverage and vice versa at least for voice.
Verizon is switching to VoLTE, GSM based but not the GSM/LTE that ATT network is.
voice is on the LTE band rather than the 2g/3g band like CDMA and ATT GSM phones are.
and currently ATT and Verizon use different frequency bands for LTE.
eventually if everyone switches to VoLTE on the same bands then roaming on each others networks will be back.
But our verizon phones are also dual mode, GSM and CDMA.