Miami Beach, FL
You need four carriers for competition
3 carriers are not enough to maintain competition, unless you want to use heavy handed regulation. This has been shown in Europe, where you recently in most countries only have 3 national carriers. All teh MVNO's do not make that much difference The effects are so negative that now the EU commission considered blocking the Telefonica take over of E 2 in Germany. the problem off course what they have is that it will be very difficult to explain why would they block this one but not all similar 4 to 3 mergers in other counties- that's what happens when you wake up too late.
Yes, ATT take over of TMO would have been absolutely catastrophic, but this one is catastrophic enough.
Wonder whether Mr.Son will pay his incentives to the regulators in Yen or in dollars.