My Iphone is stolen. I have question

Ghazal.jafari Said:

"My Iphone is stolen. I have question: Hello. My aunt has stoled my phone and she has my passcode. Can I use stolen mode in icloud and she cant use phone?"

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To add to the above, modify all credentials:

• Modifying: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associating: a different method of payment to your account
• Enabling: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

Try Find My Phone using the below.

Find My Phone - Lock and track your device using Lost Mode.    

Find My Phone - If your device is lost or stolen.      

If she is being nefarious, then she probably has changed your passcode by now. I think you are unlikely to be able to do anything at this point, but see what Eric Root said above.