Once you complete the optimization of your TCS website and proceed to the TCS Control Center you will notice a selection called "Mobile Phone Site Activated (Chambers of Commerce Members Only). 

Once you click this you will see what is showing below and you then enter the name you would like.  Below you can see the final address to your new mobile phone (.Mobi) website will be in this case http://demo.chamberbyphone.mobi.  If you are a CPA located in Arizona you might choose ArizonaCPA and then your address would be http://arizonacpa.chamberbyphone.mobi.  The real reason for doing this is so your business will not ALSO be indexed on websites and search engines that specifically cater to the mobile phone and smart phone users.