This isn't the first time we've seen the LG Windows Phone LS831. It's appeared on WP Bench and we first caught wind of the device being at the FCC back in October 2011 but only had the FCC ID label to show for it. There's even some speculation this is the LG Fantasy. Now we have pictures (doesn't look like the leaked pics of the Fantasy) and more information that could make the LS831 Sprints new Windows Phone.
FCC documentation on the LG LS831 indicates this Windows Phone support CDMA in the EMSR 800MHz band. A band used by Sprint. The LG Windows Phone also supports the 1900MHz CDMA band. Along with the banding, you also have a Sprint/Nextel Waiver included in the FCC Documentation that ties the mysterious device to Sprint.
source: FCC via: Phonescoop
