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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.
All cellular phone networks worldwide use a portion of the radio frequency spectrum designated as ultra high frequency, or UHF, for the transmission and reception of their signals.The ultra high frequency band is also shared with television, Wi-Fi and Bluetooth transmission.SM had already been running for some time on US PCS (1,900 MHz) frequencies. And, some NMT-450 analog networks have been replaced with digital networks using the same frequency. In Russia and some other countries, local carriers received licenses for 450 MHz frequency to provide CDMA mobile coverage area.