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Join Date: Apr 2009
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Taken from here
3G (UMTS/HSPA/HSPA+) service by T-Mobile exclusively uses the AWS 1700/2100 MHz frequency-band, making it incompatible with other existing 3G UMTS/HSPA networks already established in the United States. On the 5th of January 2010, T-Mobile announced that it has upgraded its entire 3G network to HSPA 7.2 Mbit/s which is an improvement from its previous peak of 3.6 Mbit/s. T-Mobile also said that it plans to be the first U.S. carrier to deploy HSPA+ across its network by mid 2010. T-Mobile has finished HSPA+ trials in Philadelphia and has begun deploying HSPA+ across its network, HSPA+ is still available in Philadelphia. HSPA+ 21 service is now available to over 100 Million POPS.
Frequencies used on the T-Mobile USA Network
Frequency Protocol Class Notes
850 MHz GSM/GPRS/EDGE 2G Non-native accessible via roaming agreement
1900 MHz GSM/GPRS/EDGE 2G Largest network in the United States
1700/2100 MHz UMTS/WCDMA/HSPA/HSPA+ 3G Uses AWS Auctioned Spectrum
AND WHEN EVERYTHING ELSE FAILS...