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PCMag reviews products, but we may earn affiliate commissions from buying links on this page.. Two basic technologies in mobile phones, CDMA and GSM represent a gap you can't cross.

They're the reason you can't use many AT&T phones on Verizon's network and vice versa. But what does CDMA vs. GSM really mean for you? CDMA (Code Division Multiple Access) and GSM (Global System for Mobiles) are shorthand for the two major radio systems used in cell phones. Both acronyms tend to group together a bunch of technologies run by the same entities. In this story, I'll try to explain who uses which technology and what the real differences are. Which Carriers Are CDMA?

Which Are GSM? In the US, Sprint, Verizon and US Cellular use CDMA. AT&T and T-Mobile use GSM. Most of the rest of the world uses GSM. The global spread of GSM came about because in 1987, Europe mandated the technology by law, and because GSM comes from an industry consortium. Google Android Device Manager Unlock Phone on this page.

What we call CDMA, by and large, is owned by chipmaker Qualcomm. This made it less expensive for third parties to build GSM equipment. Activation Unlock Iphone 6.