He did the same thing at Ericcson. He's a finance guy, not network. He couldn't get 5G launched for them so that's not why VZ brought him in. He's there to make cuts and help the bottom line. That's it... As simple as that.
Ericsson on Borrowed Time
https://www.bloomberg.com/gadfly/articles/2016-06-17/u-s-probe-puts-ericsson-ceo-vestberg-on-borrowed-time
US authorities are investigating Ericsson on suspicion of corruption
https://nordic.businessinsider.com/us-authorities-are-investigating-ericsson-for-corruption-2016-6/
Ericsson ousts chief executive Hans Vestberg | Financial Times
https://www.ft.com/content/9f3ab3b4-5233-11e6-9664-e0bdc13c3bef
Ericsson Shares Jumped After CEO Was Ousted
https://www.investopedia.com/news/ericsson-shares-jumped-after-ceo-was-ousted-eric/