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There are several 3G telecommunication standards in addition to EVDO. HSPA is another 3G technology that is used by AT&T and T-Mobile. Carriers in regions such as Europe and Japan that primarily have GSM infrastructure often use UMTS for 3G voice and data. 4G is the next (fourth) generation of mobile broadband technology. In the comparison of 3G vs. 4G, the latter offers much faster data speeds of up to 1 Gbps. Verizon introduced 4G network technology called LTE (Long-Term Evolution) in late 2010 which has since evolved into LTE advanced.
CDMA and GSM networks are two types of cellular phone networks and generally if you have a device made for one, it can't be used on the other. In the US, SprintÂ®* and Verizon run on CDMA networks while AT&T and T-Mobile run on GSM networks.