I recently bought an iPhone 6 plus 16 GB from a friend. Bought it clean and hindi nakaw, he has been using the phone since 2015. The problem is he forgot his Apple ID password and change phone number na din. The good this is hindi ako ocked out sa phone since nabigay nmn nya yung PIN ng phone but I badly needed to remove his Apple ID on the phone and put in mine. I hope someone can help. Thank you and more power.
Need muna na i-unlink yung account nya from that device, syempre need nya i-log yung account nya para magawa yun, try nya kamong i-foget password, may mga security questions naman or may back up email sya na naka link dun
Apple usually allows you to log out of your iphone even without the sim and password of your apple id. Contact Apple Care or disable Find My and restore your device using ITunes.