do we put the old sim card in the new phone

Switching the SIM card is the easiest way to transfer her phone number to the new phone, as the SIM is the reference source for the phone number. There is no other data stored on the SIM.

charmsappleid Said:

"do we put the old sim card in the new phone: I ordered my daughter a new iphone 12. It came today- we're baking up her iphone x, do we switch the sim card or just log into her icloud with the new phone once her back up is done and everything will be transfered??"

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Another Method:

On Both iPhones: Enable various iCloud items.

1. Go to: Settings
2. Tap: Your Name (Top Item)
3. Tap: iCloud
4. Tap: items so that they are green
5. See if it syncs as desired