Re: What a load of crap...
You certainly can't take a Sprint phone & switch it to T-Mo's network or vice versa, not unless it's a pure 4G device.
Well, there's where it's headed. Sprint committed to a common standard for 4G once it realised that Intel's WiMax was going nowhere. Having been on IDEN it couldn't afford not to join in.
Anyway, Softbank needs the cash to pay off some debt so the deal was going to happen sometime. Expect the Sprint brand to disappear quickly.