Removing the S Pen and testing Air Command isn't really a 'general tip'. That's actually something very specific that only the Note 4 can or should be able to replicate. I highly doubt those things would function properly on a fake, but even if they did the other things I mentioned should cover the rest. I've seen a lot of videos on fake Samsung devices as well as dozens of articles of this problem. The things I mentioned were all pretty common problems found in Samsung devices specifically. If a faked or cloned device passes all of these inspections, the heck, I wouldn't be all that upset to get it. And the company faking them should be in the market with their own device as they clearly would have talents and abilities that no other counterfeiter would have.