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I have an iphone 7 plus that has been dropped numerous times. First repair was a broken display, 2nd time it was audio IC problems paired with grey wifi problems. Customer also wanted to upgrade his storage so I gave him a 256GB NAND. After 1 week he dropped the phone again

The iPhone 7 have a few issues. Is it the rear camera? Does the flashlight not work? If that is the case it is probably the flashlight if. And voice memo might be the same problem again. See if siri works.