Ajit Pai is the chair of the US regulator the Federal Communications Commission and has also been tweeting about the T-Mobile/Sprint deal.
The boss T-Mobile boss John Legere has just tweeted about that deal with Sprint.
It was billed as the merger of America's third and fourth largest mobile carriers and designed to create a more competitive firm with about 130 million customers.
But was expected to attract regulatory scrutiny - which looks as if it is getting closer to being completed as there are reports they will announce a series of changes to their deal.
Australian competition authorities have blocked a proposed merger between Vodafone Hutchison Australia and TPG Telecom.
The deal, which was announced last summer, was supposed to create a company which could better compete with Telstra and Optus.
The competition regulator had not said yet why it opposed the deal. More details are due later.
"We want to bring more people into the world of the mobile internet," says MTN boss Rob Shuter.
A merger has been announced between the Indian arm of British mobile phone company Vodafone and a local mobile phone company, Idea Cellular, creating the largest telecoms operator in India. The BBC's Rahul Tandon has been out on the streets of Kolkata to gauge how people use their mobiles in India's cut-throat telecoms market. (Photo: A rickshaw driver on his mobile phone in front of advertisement billboards in Kolkata, India. Credit: Reuters/Rupak De Chowdhuri.