Data roaming
I bricked my Nexus S yesterday, while trying to root it (with an howto for an old Android version). As usual I was trying to do too much stuff with too little time (as I had to catch my plane later that evening).
I had to root it to get OpenVPN, ssh tunnel, or system wide proxies up and running. Things I needed to by-pass the Great Firewall in China on my mobile.
