I got my white 32 GB activated this morning online via chat with Sprint. I used the sim from my wife's broken S4.
At first, I got an error saying the network didn't connect in time and that the sim card was locked. I could make calls, but no data worked. I thought I was going to have to get a new sim, but I waited an hour or so and tried a restart, and everything worked.
I was able to pick up LTE in the middle of a Meier supermarket while my wife's HTC One didn't, so I'm happy with that.