Originally Posted by larrymohr
I have done a lot of searching in the last few days since I got my Vox and there are a lot of android phone users who have the market app already on their phones and who have even downloaded free apps from the app market who can not buy the paid apps. It seems that if the market does not think that you have a compatible device then no joy. When I go to the site it says "You don't have any devices". However, lots of people with phones that came with the app market installed are also seeing the same message.
It happened to me while testing a custom ROM or when people tried to use the new market and uninstalled it since it was not for tablet, but mostly if your device comes with the market it should work. Just make sure to do a nandroid backup before playing with it.