What happens if I trade iPhones 5 for another iphone 5 and keep our SIM cards?

Does all my stuff move to the other iphone or does it stay with my old phone?

Do apps, email, messages and etc move to the other phone or stay in the old one

If you are simply swapping phones when all the information on your phone will be lost.
What you need to do before trading and phone in make an iTunes/iCloud backup.
Download iTunes and plus your iPhone into your computer. Go into iTunes and make a backup for your iPhone and the 'Factory Reset' your phone. After that, all you need to do is plus the new phone into that computer and all your data will be transferred.

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