sim card

To move your data, back it up to iCloud or your computer and then Restore the backup in the new iPhone setup process.

https://support.apple.com/en-us/HT204184

SIM card only contains your phone number - to identify you to your carrier. It's recommend to get an updated one every time you switch phones.

haydenfreeman wrote:

If I put my old sim card in my new phone will everything on my old phone be on the new one?

No!

There is no iPhone data at all on the SIM. Only cellular telephone related data, such as a telephone number, resides there.