Samsung Galaxy S4 Unlocked 16GB (S&D)

do these phones work with Sprint or which service are they unlocked for?
thanks

no LTE specs?

looking up M919 gets me http://www.samsung.com/us/mobile/cell-phones/SGH-M919ZWATMB-specs which says T-Mobile and “LTE: Bands 1/2/4/5/7/17; HSPA+/UMTS: 850/AWS/1900/2100MHz; GSM: 850/900/1800/1900MHz”

LTE cheat sheet: http://www.phonearena.com/news/Cheat-sheet-which-4G-LTE-bands-do-AT-T-Verizon-T-Mobile-and-Sprint-use-in-the-USA_id77933

Highly recommend any buyers immediately check their purchases from this deal. I bought an S4 from a similar Woot deal a couple months ago and didn’t find out until well past the 21-day return policy period that it wasn’t unlocked. It turn out that it was, in fact, still in a contract.