Please can you help me remove an icloud from my iphone 6 running iox 11
i want to remove an i cloud from my iphone running iox 11,please the phone was brought to me by my uncle
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Before signing out Apple ID you must know the Apple ID password and rest of credentials for secondary authentication account three correct answers for respective questions , date of birth , rescue mail address and its password Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support
Note : if iPhone was gifted from your uncle ask the credentials from him , if credentials are not known convert the account to 2FA see the articles Two-factor authentication for Apple ID - Apple Support
Get a verification code and sign in with two-factor authentication - Apple Support