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
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