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US Carriers mobile network frequencies ?

Mobile carriers utilize different frequencies on their networks, and knowing phone compatibility with the carrier network can definitely help in making more educated decisions.

List of frequency bands used by major US mobile carriers:

850, 1900 MHz - 2G/3G/4G (GPRS/EDGE and UMTS/HSPA/HSPA+)
700, 1700/2100 MHz - 4G (LTE bands 2, 4, 17)

850, 1900 MHz - 3G (EVDO) - currently reframing 1900 MHz for LTE
750, 1700/2100 MHz - 4G (LTE bands 13, 4) - currently building out

800, 1900 MHz - 2G/3G/4G (PCS/EVDO/LTE)
800, 1900, 2500 MHz - 4G (phased out WiMAX, moving to LTE bands 26, 25, 41)

Note: currently deploying LTE on 1900 MHz. Carrier is decommissioning its iDEN network and incorporating 800 MHz spectrum previously reserved for the Nextel push-to-talk service into its LTE network. Sprint plans on selling devices that also utilize Clearwire's TD-LTE in the 2.5 GHz, adding up to tri-band LTE

700 MHz (LTE band 12) - bought in 2014 from Verizon
1900 MHz (LTE band 2) - also 2G/3G (GPRS/EDGE, HSPA+ PCS)
1700/2100MHz (LTE band 4) - 3G/4G (HSPA/HSPA+/LTE)

Metro PCS (now part of T-Mobile)
700 MHz (LTE band 12)
1900 MHz (LTE band 2) - 3G/4G (PCS/EVDO/LTE)
1700/2100MHz (LTE band 4) - 3G/4G (HSPA/HSPA+/LTE)

Note: After the merger between T-Mobile and MetroPCS, T-Mobile is moving its CDMA frequencies, freeing the AWS 1700 MHz spectrum for LTE.

US Cellular
850 MHz, 1900 MHz - 3G (PCS/EVDO)
700, 850 MHz - LTE bands 12, 5

See Also: Wikipedia US Carrier Frequency Use

Note that there are two common mobile network standards used in the US: GSM (Global System for Mobile) and CDMA (Code Division Multiple Acces). GSM is the more commonly supported international standard, very few countries besides the USA use CDMA based networks. While networks are constantly evolving, traditionally, AT&T and T-Mobile are GSM providers, while Sprint, Verizon, MetroPCS and US Cellular utilize CDMA.

The LTE frequency bands used in the US by the top 10 carriers are as follows:

LTE band 2 (1900 MHz) - T-Mobile, Metro PCS
LTE band 4 (1700/2100 MHz) - T-Mobile (primary), Metro PCS, Verizon (urban areas)
LTE band 5 (850 MHz) - US Cellular
LTE band 12 (700 MHz) - T-Mobile, Metro PCS, US Cellular
LTE band 13 (750 MHz) - Verizon (primary)
LTE band 17 (700 MHz) - AT&T
LTE band 25 (1900 MHz) - Sprint (primary)
LTE band 26 (800 MHz) - Sprint
LTE band 41 (2500 MHz) - Sprint

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