A screenshot of a Samsung Galaxy Note 4 in Service Mode, taken by a T-Mobile customer, shows that the phablet is connected to LTE Band 12 (700MHz) in Detroit. T-Mobile has been adding 700MHz spectrum in some markets, some of it purchased from Verizon earlier this year. Earlier this month, LTE Band 12 was spotted by T-Mobile users operating in Long Island and in Houston.
According to the Service Mode, the T-Mobile pipeline on LTE Band 12 has a 5MHz x 5MHz bandwidth. This past Summer, T-Mobile CFO Braxton Carter said that eventually, all of the metro areas where T-Mobile operates will offer bandwidth of 20MHz x 20MHz. Larger bandwidth allows more traffic to use the carrier's pipeline, without suffering the network congestion that usually slows down data speeds.
At left, Service Mode on a Samsung Galaxy Note 4 shows the device is using 5MHz x 5MHz LTE Band 12; at right is a screenshot of a speed test, showing the speed of T-Mobile's 4G LTE network
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