How to identify fake mobile phone accessories

I'm thinking of starting sourcing original mobile phone assessories, but how is it possible to tell if those are original or fake?
Different data cables, mobile phone covers, batteries and so on.
Are there some numbers or anything on them, to see if it is original or not?
Dont want to accidentaly buy china fakes.

Hi Margus555,

Here's an eBay Guide on original and fake Nokia Phone Accessories. The general ideas on differentiating original from fake may apply to other brands, too.

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Cheers,