just do a search for it. you can see lots of sources pointing to the break-up fee of $2b. and yes, there was a formal bid but never got to the regulators for approval process. speculation was that legere would have ended up leading the combined companies and under the name of t-mobile. wait for the next couple of weeks and there may be a few other potential bidders coming in that won't have too much difficulties passing the regulators.
No, the question was not if there was a 'formal bid' but whether there was a 'formal deal' approved by the two companies and their parent companies and approved by the two Boards of Directors. That never happened. As far as has been reported, there was never a formal agreement between management that was signed and, subsequently, put before the BOD's for approval. That may seem just like a formality given both T-Mobile and Sprint are majority owned by Deutsche Telekom and Softbank respectively. However, it is a required legal formality... for the 'bid' to become a formal deal. If the management's and BOD's were to sign their approval to make the agreement formal, it would, within days if not hours, be put before the DoJ, FCC and communications committees of Congress and the White House. If that had occured, you would have heard about it loud and clear.. blasted across the media and stock boards.
This is misinformation. There was not ever a formal bid. There were discussions about hypothetical arrangements, and they may even have come to an agreement on how things would be laid out, but no bid. The sources you're talking about were referring to what the breakup fee was speculated to be if there had been a bid.