Serial number wrong on iPhone 4S?

Well I just noticed that my serial number on my sim tray on my IPhone 4S is different than the one on the software. I probably switched sim trays because I was messing with my friend's SIM card and they got switched. And he thew away that iPhone because he broke it so now I have a sim tray with the wrong serial number. And I have apple care+ on this iPhone but since it has the wrong sim tray it won't show up. So how do I fix this? Planning on selling it but can't transfer apple care because of sim tray serial.

Get an iphone 5

5ththththth

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