They also bought Sprint in USA, and I am a loyal Sprint customer and praying they start delivering on the potential they could infuse into the USA mobile infrastructure.
I'm a SoftBank subscriber in Japan who regularly travels to the US for business. My Japanese phone just automatically switches to Sprint in America, which is extremely convenient for me.
I ended up switching from Sprint to Ting; same network, but 1/3 the bill (Advertised price was only 40% less, but Sprint tacked on nearly 60% in unadvertised fees).