

T-Mobile supports these bands:
-
5G: n2/41/71/258/260/261
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5G,ER: n25
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4GLTE: B4/5/12/71
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4GLTE,ER: B25/66
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2G,GSM: B2
Fairphone 5 supports these bands:
-
5G: n1/2/3/5/7/8/20/28/38/41/48/71/77/78
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5G,ER: n66
-
4GLTE: B1/2/3/4/5/7/8/12/20/28/32/38/40/41/42/48/71
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4GLTE,ER: B66
It looks like the Fairphone 5 covers T-Mobile’s 5G Frequency Band 1 frequencies (bold), but Frequency Band 2 is not covered (italic).
Regarding 4G, the Fairphone 5 covers all LTE networks (bold) except for extended range band B25 (italics).
it doesn’t support US bands for TMobile
It covers some, but not all.
Thanks for compiling this so I can reference it later if Firefox ever becomes an issue