Back in 2017, T-Mobile was the big winner in the FCC’s auction of 600MHz spectrum. The low-band airwaves travel long distances, penetrate structures, but do not deliver blinding fast download data speeds. T-Mobile has used this spectrum to create its nationwide 5G network. But the big haul came on April 1, 2020, when T-Mobile closed on its $26 billion acquisition of Sprint.
AT&T asks the FCC to block T-Mobile from adding to its holdings of mid-band spectrum