iphone testing refurbishing

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Hi

I am newborn to the ambulatory sound repair business. I have got 15 apple iphone 3g ambulatory phones. I would same to refurbish them and resell. I was wondering if someone could kindly tell me the best way the full effort the iphones and the boards to make trusty they are 100% working.

Is there is iphone diagnostic code available to effort the iphone?

What is a noesis leakage effort & useful effort and how do i do this on a iphone?

Whats the best impact to ingest to refurb a iphone?

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