I reported on this yesterday. And yes it appears only the Senate has been offered the Sat phones. And, only about 50 senators have accepted them. That feels like its running along party lines. Imma guess the Republicans are accepting and the Dems not so much.
This begs several theories. I certainly have a couple.
You did? It is not in your posting history.
Second, what you are stating fails to make any sense. Republicans would respect the succession as laid out in the Constitution.
This looks more like a set up to tyranny.
If it is a military take-over (highly doubt since the purge), then McCarthy would be the logical temporary President based on the Constitutional Continuity of Government.