AT&T Can a Iphone from at&t be flashed to sprint?

[cellulartalk]

I got this iphone 4s off craigslist and it was for at&t I figuered that didn't matter because I can have it flashed. Now i'm hearing online that a phone with a sim card aka (at&t/Verison) can't be flashed for whatever reason. Is this true? Did I lose all my money I paid or can it be flashed? Please...

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