You don't need to go through all of the trouble of creating a separate domain. This is what we're trying to avoid with OMFramework:
- Your mobile visitors are automatically redirected to the mobile site, while the desktop visitors still see the desktop site
- We've added the necessary code to have your mobile site indexed by mobile search engines
- You can enable/disable your mobile site in a single click from the OMF Administration. No need to deal with domains.
Creating a separate subdomain just for OMF isn't recommended or necessary, unless you have a very important reason to do so.