Sent from my Radar 4G using XDA Windows Phone 7 App
Are you completely sure?
It says that it could enable 850mhz in a EU 900mhz lumia 800 one.
Sorry, the main post of the thread was not updated, last comments says it does not work.
-Big improvement on Cellular data. Network B/W on Rogers 3G jumped from 3-4Mbps to 11-12Mbps. This means High speed is working.