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So I have opened my Kindle Paperwhite 1 and found that there is a modem with some SIM card. I was wondering if it's possible to put my own SIM card and the network would work?
Or it's possible but very difficult and requires a lot of knowledge and hacking. And finally, if all above positive, would it be also possible to thether this connection to the PC?

Spoiler:

I remember that probably in the old days, when some 3G kindles had free all-around-the-world connection to amazon, wikipedia etc., and people hacked their kindles so they not only thetered the connection but also tunneled it, so they could use other sites.