I am giving my phone to my cousin, he is unable to login his apple id in my phone.
We are unable to login another apple id to my phone.
We are unable to login another apple id to my phone.
In order to log in with another Apple ID, you must first disable "Find my iPhone" on your old phone and then log out of your Apple ID. After that, you should erase your phone completely and let your cousin build his own phone anew.
I am giving my phone to my cousin, he is unable to login his apple id in my phone.