If you don't get AppleCare Plus for the iPhone Duo, any repairs are going to be pretty expensive. Apple published the estimated repair costs for the iPhone Duo without AppleCare Plus today, as reported by MacRumors, and they can be high: Battery service, for example, will cost $229, inner display damage will cost $999, and "other damage" costs $1,499.
Here's Apple's estimated costs for various repairs if you don't have AppleCare Plus:
Cover layer damage $49
Back glass damage $199
Battery service $229
Rear camera damage $229
Outer display damage $379
Outer display and back glass damage $509
Inner display damage $999
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