What is best way to change out SIM card on my iPhone 11?

Hi luna_girl,

From your post, it sounds like you'd like to get help with changing your SIM card without data loss. We recommend backing up your iPhone prior to the switch: Back up iPhone

You'll see instructions in the same article to restore the new phone from that backup where it says: "Tip: If you replace your iPhone, you can use its backup to transfer your information to the new device. See Restore all content to iPhone from a backup."

Take care.

Changing the SIM should have no impact on your data, as there is no data saved on the SIM. All data is on the phone itself, the iPhone does not write to the SIM.