Now that it's fully legal again, there are services to unlock Sprint iPhones. I used one that is legit, in that I restored my iPhone and it said "congrats, your iPhone is now factory unlocked." I tried a T-Mobile SIM and it worked perfectly. My question is that should I need to get the phone replaced under warranty and go to the Apple store, will they give me a new unlocked phone for domestic use? Like I said, the phone seems to be completely factory unlocked... Just not through Sprint. The service said it was done through "Apple factory unlock." not Sprint.
For those of you that say there are no unlocked domestic Sprint phones that are sold, there are, just through Apple directly if you pay full price.