In the US, Verizon, US Cellular, and the old Sprint network (now owned by T-Mobile) used CDMA . AT&T and T-Mobile used GSM. Most of the rest of the world used 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.
Read moreHow important is Band 14?
Having Band 14 in every device—especially with transmit enabled—might enable hackers to interfere with public safety’s use of the FirstNet network, or compromise the network itself . And at times when the network is overloaded with public-safety use, it would not be available for citizen 911 calls or alerting.12 Haz 2013
Read moreWhich 5G bands does Verizon use?
Verizon’s 5G Ultra Wideband network uses 28 GHz and 39 GHz mmWave spectrum bands. This will aid the network in speed and capacity, as a higher number of devices will eventually be able to operate on that high-frequency spectrum.
Read more