Sony-Ericsson announced that it had joined the WiMAX Forum, a group of companies committed to the still new wireless Internet standard. The move gives the cellphone maker inside access to the format and is likely to indicate the company's approval of the standard for its future devices. No hardware has been announced by but is likely to include notebook cards and smartphones that could take advantage of the extra speed. Today's entrance is primarily an attempt to "understand the technology and the opportunities" in the market before jumping in, Sony-Ericsson says.