setting up new iPhone 12 mini, after transferring sim card from iPhone 6, i've somehow lost my homepage icons

Hello turtle_dan,

Thanks for using the Apple Support Communities. We understand that you're setting up a new iPhone and are running into some issues. To clarify, how did you set up your new iPhone? Did you use the Quick Start option or are you installing a backup from iCloud or a computer?

Use Quick Start to transfer data to a new iPhone, iPad, or iPod touch

Use iCloud to transfer data from your previous iOS or iPadOS device to your new iPhone, iPad, or iPod touch

Restore your iPhone, iPad, or iPod touch from a backup

Since noticing this change on your iPhone, after the SIM card was inserted, have you tried restarting or force restarting your iPhone?

Restart your iPhone

Force restart your iPhone

Best regards.