Does unused Sprint SIM expire/get deleted from system?

Kun WangKun Wang Posts: 7FreedomPop Newbie
I bought a used iPhone 6 plus model A1524 from eBay for my friend and it came with a Sprint SIM. That's a gem and I instantly grabbed it for my future iPhone 6.
Question is, does this thing stop working after some time? Want to know if I'm in a hurry to buy an iPhone to activate.
And will it work on iPhone 6 model A1549 or A1586?
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