Alright. I did that and then I forced it to LTE only. It didn't find a signal (there is LTE here in this location). So I toggled airplane mode and for a brief flash of a fraction of a second, it indicated a strong LTE signal (full bars) before immediately falling back to a moderate 3G signal. So I toggled it again. Same thing. Brief flash of LTE and then back to 3G (with really decent speeds on 3G, mind you). I'm on wifi at home of course and so it's not the biggest issue right here. But I wanted to share my findings.
Also while at work yesterday I did force it into LTE only mode and DID connect to LTE but not nearly as strong of a signal as my GS4 picked up in the exact same location. I will try talking to Sprint again in the store nearest me but the last 2 times I went in they seemed to not even know what ecsfb is nor anything about network vision 2.0. The tech wouldn't even look at my phone. He just said, "oh yeah, just give it some time. Once the towers are upgraded it will be fine."
That's why I let it ride out so long. Unless they can demonstrate that the phone is, in fact, faulty then I can get a replacement from Google. But I need them to definitively tell me/prove it first.