which cell services use cdma
Most US cellular carriers use CDMA. 4G phones generally use LTE (Long Term Evolution), a high speed wireless broadband technology. In most of the world, GSM is preferred and 4G phones with LTE outside of the US use this service.
Before you switch - know your cell phone. Not all phones can be used on all networks, as US carriers donât all run on the same kind of technology. Cell phone companies operate under one of two types of networks; either CDMA or GSM. Out of the biggest US carriers, AT&T and T-Mobile run on GSM networks, while Sprint and Verizon Wireless use CDMA.