fromsouth, I really doubt you try to help in this discussion as you give wrong information and speak like there was no mistake from Apple USA but just stupid people who understand nothing and take the line 5h ready to spend 700$ for something doesn't work.
First, and this is the point this problem happens because of Apple store USA not because of people buying their phones
Second, I don't care about locked or unlocked process, but you should revised your Apple knowledge, Apple is involved in the process as Sprint sends unlock request to Apple and Apple confirms to Sprint when it's done ... But in our case it's already "unlocked" ... I know , I know it's impossible like AT&T one ...
Third, I don't care about high level people or low level people in Apple but as you should know ( but may be it's too far for you to imagine ) Apple Singapore might be a big Apple Hub for this part of the world and I believe "high level" enought to report the problem "high"X2 Apple.
For me there are 2 options :
Like Roman I hope it can be fixed with a software update or something from restoring the phone on iTunes
In case this can not be fixed Apple must propose something to fix the massive unfair mistake like arrange to return the device with the nearest Apple shop or something else.
I don't try to convince you but just wanted to inform others