SpaceX 800MHz low-band spectrum acquisition -

SpaceX has acquired nationwide licenses for up to 14 MHz of paired low-band spectrum in the 800 MHz frequency range.

SpaceX agreed to buy a nationwide portfolio of 800 MHz licenses from Grain Management, up to 14 MHz of paired low-band spectrum. The Wall Street Journal put the price at about $8 billion in cash.
The deal still needs FCC approval.
SpaceX says its 2 GHz mid-band spectrum supplies capacity, while the 800 MHz band adds a layer that reaches phones inside buildings.

The active constellation is about 10,200 satellites, including 9,600 broadband units.
SpaceX already helps T-Mobile fill cellular dead zones. T-Mobile still handles the subscription, billing, and customer support.
The FCC approved a 15,000-satellite constellation for Starlink Mobile. Second-generation satellites start flying in 2027, with service going live at the end of 2027.
Starlink subscribers doubled to 12 million.

Ground network (biggest gap): SpaceX’s plan is to place small cellular radios alongside existing Starlink dishes rather than build new macro towers. That is a build/own approach. Analysts note 14 MHz is a modest slice, and reliable high-capacity service in dense cities would still require terrestrial towers. That leaves a rent-or-acquire question for dense-urban sites.
Carrier operations: A Starlink-branded service would give SpaceX control of the customer relationship, which means it must build or rent billing, care, and the core network. I found no public source describing these, so I flagged them as inferences.
Satellites on 800 MHz: The new satellites are built around 2 GHz, so I treated 800 MHz as primarily a terrestrial indoor layer. Whether satellites will also use it isn’t stated in the sources I found.

The map: they still have to build/buy many capabilities

All this is not going to happen overnight, and this direction is not new.

Here the map of capabilities that they have and they should have.

I do not know the reaction of the market on AT&T (-10%) and VZ (-10% too).

This is gold for swing traders that understand the difference between the news and the facts happening over the time.