How do I get my passcode
I forgot my password to my old phone
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You create the passcode yourself when setting up the phone.
After that you MUST remember it.
There is no means to “recover” it, you can only reset the phone - which completely erases it - and restore from a backup.
You WILL need your AppleID and password.
How to remove your iPhone, iPad or iPod touch passcode without a computer – Apple Support (AU)
Note: If running iOS prior to 15.2, you’ll additionally need a cable and a computer to follow the instructions linked near the bottom of the article.