It depends on your carrier and equipment. There's no special wireless-enabled version of Cyburbia, although I've tried visiting the site using wireless devices, and it works most of the time.
On my Internet-enabled Sharp phone, on the Sprint network, the main Cyburbia page doesn't load; I get a bunch of jibberish. The Palm and Windows-based PDAs issued by the GSM cellular networks in the US should work, I've been told. The Forums look fine using Opera on my Sharp Zaurus 5500 (a Linux based PDA) when I'm using a WiFi card.