how to wipe a iphone
I have an extra phone. Now I want to use it because my phone is cracked. I have no Apple ID access to it so I can't get into the phone.
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You don't, sorry.
If you are talking about "activation lock" (an anti-theft measure), neither we, just users like you, nor Apple can help you, unless you are the original owner and you still have the proof of purchase (receipt/invoice reporting your device’s IMEI or Serial Number). Should be this case, start your request using this link: https://al-support.apple.com/#/additional-support
Shouldn’t be this case, activation lock can be removed only by the previous owner, with the credentials that were used to activate that iPhone/iPad. Without those credentials, that device is useless to you.
You can also take a look at this support article:--> How to remove Activation Lock - Apple Support
Regards
Giulio