What GSM and CDMA Mean for You and Your Cell Phone
GSM unlocked vs. This means a fully unlocked phone can use GSM AT&T as well as CDMA Sprint services seamlessly. Nexus 5X is a fully unlocked cell phone straight from the manufacturer and comes with both GSM and CDMA capabilities. It works with all American providers like Verizon, AT&T, T-Mobile, Metro PCS, and more.