okay, so i have my iPhone 5 and my iPhone 6. the 6 is vanilla iOS 8.0 and has my active sim in it. I'm with Verizon, and have the 5 activated with no sim in it. can i put an old Verizon sim in it, or will that mess up my current sim in my 6? i have the original sim from my 5 laying in a drawer, but i don;t wanna put it in there if it will mess up. any help is appreciated. thanks!