I have an iPhone model A1533 that I had given to my cousin a while back. She misplaced it while travelling overseas about two years ago.
We have recovered it recently but she doesn't remember the email address, user name nor password used on it. Is there any way possible to reset this phone and be able to use it again?
To reset the passcode:
https://support.apple.com/en-gb/HT204306
If it is then activation locked, you need to start with getting back your apple ID.
If you've forgotten your apple ID:
https://support.apple.com/en-gb/HT201354
Apple id account recovery:
https://support.apple.com/en-gb/HT204921
Then to remove activation lock (you need the apple ID)
To reset the passcode:
https://support.apple.com/en-gb/HT204306
If it is then activation locked, you need to start with getting back your apple ID.
If you've forgotten your apple ID:
https://support.apple.com/en-gb/HT201354
Apple id account recovery:
https://support.apple.com/en-gb/HT204921
Then to remove activation lock (you need the apple ID)
Here are some articles that may help.
Resetting a phone that was lost
