Seems they've added sprint network capable device to the list. Nice to have options! More devices like this should become the norm!http://www.androidcentral.com/nexbit-robin-now-compatible-all-major-us-carriers-addition-sprint
Added a link to android authority speaking about it,http://www.technobuffalo.com/2015/09/23/nextbit-robin-confirmed-with-sprint-support-too/