Table:
text: T-Mobile US
Radio frequency spectrum chart
T-Mobile Network
Frequency_Band Band_number Radio_Interface Generation Status_ Notes_
1900 MHz 2 GSM/GPRS/EDGE 2G In Service Most of this spectrum will be upgraded to 4G/LTE networks in the next two years. (More Details See 4G LTE Upgrade) It is unclear if that means this network will be decommissioned anytime soon, but it is possible.
1700/2100 MHz AWS 4 UMTS/DC-HSPA 42Mbit/s 4G In Service Has marketed 3G HSPA+ as 4G since 2011. Covers 230 million+ POPs as of March, 2014.
1900 MHz PCS 2 UMTS/HSPA+ 21Mbit/s 4G In Service/Building out HSPA+ 21Mbps on the 1900 band — this is due to the T-Mobile’s 1900MHz not being DC-HSDPA capable. Moving 3G HSPA+ traffic to this band. Covers 203 million POPs as of Oct, 2013
1700/2100 MHz AWS 4 LTE 4G In Service/Building out Covers 210 million POPs as of March, 2014

text: T-Mobile US
Radio frequency spectrum chart
T-Mobile Network
Frequency_Band Band_number Radio_Interface Generation Status_ Notes_
700 MHz Block A 12 LTE 4G Rollout starts by Q4 2014 Spectrum acquired from Verizon Wireless
1900 MHz PCS 2 LTE 4G Rolling out in 2014

Question: How many times does T-Mobile US list 4g as a generation?