How do i sync apps to my iPhone 4S using itunes without losing aps already installed on the phone but with a different apple ID, and i dont have the apple ID??

how do i sync apps to my iPhone 4S using itunes without losing aps already installed on the phone but with a different apple ID, and i dont have the apple ID??

How have you managed to get apps on your phone that are tied to a different and unknown AppleID?
If these apps were not purchased by you, having them is effectively software piracy and you should purchase them using your own AppleID if you want to keep hem.

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