How to get rid of a second Apple ID on my iPhone?

I used my friends computer to download music onto my phone using his Apple ID, and now it asks for his password for his Apple ID, which he forgot for whatever reason, whenever I go to download new apps or update some of the ones I already have. Is there any way to get rid of this problem?

You will need the password. Keep in mind if your phone is now assigned to his apple id, he can now track you with find my iphone and can remotely wipe your phone among other things. Thats why you don't do stuff like this.

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