iPhone reset.
Changing my sons SIM card to my old 7. How can I fix the issue of it asking for my old information
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Perhaps this will help: https://support.apple.com/en-us/HT201365
You need to log in first with your AppleID, then remove the activation lock. Then you can erase and reset, and finally log in with the other user's AppleID.
If you are locked out of your Apple ID account you can go to https://iforgot.apple.com
This will provide you with the recovery steps you put in place for this situation.
Here are some support articles that should help:
If you forgot your Apple ID password - Apple Support
If you forgot the answers to your Apple ID security questions - Apple Support
If your Apple ID has been locked or disabled – Apple Support