I recently got a new iphone 6 and i'm?

I recently got a new iphone 6 and i'm?

Added (1). going to give it to my sister, I got a new sim with my new iphone 6 Now when i give my other phone away of course i will be taking the sim out of it. But when my sister gets her own sim in there and makes an itunes account will my texts etc still be in the phone itself?

It shouldn't have, but reset the phone to factory settings anyway so she can add it to her Google/Apple account.