YouTuber LE55ONS is rightly famous for a string of 'how to' dismantling/repair videos on smartphones and his latest is the Nokia 808 PureView, embedded below, showing how to take out just about every part of it, for repair purposes in the future, should you find yourself out of warranty. Personally, this sort of thing is just geek-porn, so grab a bag of popcorn, sit back and enjoy the video....
As usual, maximise the window and up the quality as needed.
Fascinating stuff, especially the size of the camera module and the way some of the major components are just push-fitted together.
Obviously, don't attempt anything like this yourself unless you're a) out of warranty and b) fully conversant with what to do.