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Similarly one may ask, what carrier is compatible with cricket?
any AT&T phone locked or unlocked will work fine oncricket since cricket uses AT&T. T mobile phoneswill work as long as the phone is unlocked and has the right radioto get AT&T's LTE. verizon LTE phones will work since they arefactory unlocked.
In this way, what carriers are CDMA?
In the US, Sprint, Verizon, and US Cellular useCDMA. AT&T and T-Mobile use GSM. Most of the rest of theworld uses GSM. The global spread of GSM came about because in1987, Europe mandated the technology by law, and because GSM comesfrom an industry consortium.
Boost and Virgin are owned by Sprint, which runon the Sprint CDMA network. There's no GSM networkfor any of them. Verizon is the other carrier with a separateCDMA network. T-Mobile and AT&T each have theirown GSM networks.