Forgot icloud password and email


    I bought an unlocked T-Mobile iphone 6 (used) from Ebay and gave it to my mom. She set it up with a new icloud account then used it in some days. Then she changed her mind and returned it to me after reset the phone without logout icloud account. I didn't check or use it. After around a month, I wanted to use it and found it still link to her icloud account. I asked her and she took around two hours for trying to find the icloud information out her mind but she could not. Is there any way to fix the phone ? My cousin said I need bill receipt from Apple but how can I have ? I bought this used phone from Ebay, not Apple. I hope T-Mobile can check the phone serial number with my mom phone number and proof that my mom used to own this phone.

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