There are plenty of cheaper CDMA phones that don't support GSM. Most of the higher end phones support both.
And then there is another scenario like I believe some of the Google Nexus tablets only support LTE on Verizon and won't work at all if there is no 4G on a CDMA network. It will work on 3G/3.5G GSM networks.
And then there is another scenario like I believe some of the Google Nexus tablets only support LTE on Verizon and won't work at all if there is no 4G on a CDMA network. It will work on 3G/3.5G GSM networks.