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T-Mobile Launches mmWave 5G With Samsung Galaxy S10 5G

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No Sub 6?


Jun 26, 2019, 10:30 AM
Interesting that this version of the S10 5G doesn't support Sub 6, while Sprint's version does.
Rich Brome

Jun 26, 2019, 3:16 PM
Well, yes and no.

Like most first-wave 5G phones, the S10 5G uses Qualcomm's X50 modem. The X50 only supports unpaired bands using TDD. It doesn't support paired bands / FDD. Sprint's band 41 (2.5 GHz) is an unpaired band using TDD, whereas most other sub-6 bands — including all of T-Mobile's — are paired bands using FDD.

In other words, Sprint's unique band 41 is the only sub-6 band in the US supported by Qualcomm's current 5G modem for phones.

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