Nook Torn Open, Hacked, and Rooted
wired.com
wired.com
I think you'll find this is not true.
In particular, in the Nook FAQ:
Your nook can connect to B&N Fast & Free Wireless networks in the United States. These networks are cellular data networks that are widely available. In areas without B&N Fast & Free Wireless coverage, you can rely on Wi-Fi to access network services. … Your nook CANNOT connect to other cellular data networks in the United States. It cannot connect to any international cellular data networks, including those in Canada and Mexico. …
I'd say they have created their own private cellular enclave and are in control of what comes and goes.
Regardless of their technical filtering, you should read your license carefully. I don't have a copy, but phrases like there is no charge for you nook's wireless capabilities do not imply that you can implement your own features and use their cellular service free of charge.
take off the plastic casing, remove the embedded microSD card, mount it as ext3 fs, `sed -i -e 's/^\(.\+\)adbd\(.\+\)disabled\(.\+\)$/\1adbd\2enabled\3/g' init.rc`, umount, put sd card back into nook, use android dev toolkit to connect to port 5555 and start a shell
This is kind of amazing to me. An open android device with free cellular internet access? If it has a mic this could replace my phone...