Jetspeed supports the Wireless Application Protocol (WAP)
The Wireless Application Environment allows information to be displayed on mobile devices such as cell phones. Jetspeed portlets can format information in WML, providing simple integration with a multitude of applications for display and interaction on mobile devices.
It is important to note that Jetspeed does not explicity target WAP. It is designed to support multiple content types.
Whether a specific device is supported depends mainly on the WAP gateway that's being used. So all that can be said about Jetspeed, is that it produces valid WML 1.1 and 1.2.
The list below is a partial list WAP Phones and WAP Browser the have been used with Jetspeed.