How to change preferred network type in Samsung

Difference Between GSM, UMTS, CDMA, CDMA2000, and LTE GSM and CDMA were used to move into the 2G network, while UMTS and CDMA2000 were used to transition into the 3G network . LTE, on the other hand, migrates CDMA/CDMA2000 and GSM/UMTS into the 4G network.

Preferred Networks is connected to the internet over multiple, very high speed fiber-optic links to links provide you with multiple paths onto the Internet for reliability and the fastest possible connection .