Warranty Concern Over Swapping Iphone 4 with a Friend for Jailbreaking ?

I just bought an iPhone 4 and it turns out it has 4.0.2. Can’t jailbreak it.  My neighbor, who is with at&t, has an iPhone which has 4.0.1.  I’ve asked her if she would be willing to trade me so I can my unlocked iPhone 4.  She’s okay with it but has one concern.  Shes worried she will have problems with the warranty.  Believes her purchase will show the serial # of the one she gives me.  Will there be a problem ?

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