Sonim XP5S (sprint only?) wifi with zello?

[IAmSixNine]

I have an Inrico T320 for Zello. I like it but want to get a better unit. Saw some Sonim units and want to go that route. I see on amazon a listing for a Sprint only Sonim SP5S for $25 bucks. Im thinking ok whats the catch. Maybe one of those non wifi or if wifi works it may not let you load zello.
So figured i would see if anybody has experience with one of these.
Thanks