Sprint Sim cards are one use items, once activated with a phone or associated with a phone, they can never be used with another phone again.
These are Sprint branded sim cards, most Sprint MVNO’s use regular Sprint sim cards including carriers such as Flash(S).
The other unique part of Sprint sim cards is that just because the sim card fits the phone does not mean it will work with the phone. Below we will give you a partial list of sim card models and the phones they will work with.
206R: S4, S5, Note 3, Note 4, Nexus 5, HTC One, HTC One Max, LG G2, Samsung Mega, S5 Sport, and most android models
207R: S4 Mini, Note 3
406R: Iphone 5
416R: Iphone 4S
436C: Ipad Air, Ipad Air 2, Ipad Mini 3, Ipad Mini With Retina, Iphone 5C, Iphone 5S, Iphone 6, Iphone 6 Plus, Iphone 6S, Iphone 6S plus, Iphone SE