LOL, saw this under the user opinions and reviews section in GSMarena's HTC One review.
http://www.gsmarena.com/htc_one-reviews-5313p3.php"Hi every1 I m sharing something that I bet not even 0.001% of the people know.
To check weather your phone is original or china clone:
Open settings ... about device....android version--- 4.1.2 or something like that--- quickly tap 3 times on 4.1.2--- jelly bean will appear--- press long on bean--- many small jelly beans appear moving on screen then it means true jellybean operating system.Check kernel version under about device in settings---- numbers ended with #1 is qc (Quality Control) passed phone for market. #2 #3 are qc failed lower grade, bad quality phones.
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I checked on my phone & it shows that jelly bean is original.
But the QC number I get is #2. when i asked the shopkeeper, he checked his other handsets in stock and they also had #2/#3 in them. (Poor man didn't know how to check the quality of a phone) So, at end it means that I got a handset with #2 Quality Control. But the shopkeeper from whom I bought my phone got entire stock of BAD quality.
HAHAHAHAHAHA
Recommendation For Every1:
DO CHECK THE QUALITY AND ORIGINALITY OF YOUR DEVICE BEFORE BUYING BECAUSE U WILL PAY THE SAME AMOUNT FOR A GOOD QUALITY PHONE AS WELL AS A BAD 1."
Not sure if true or just trolling

I cannot do this...