it's not WIX extended internet on cingular, it's something like wireless extened internet
tell them to look for "extended internet". There's not that much to look through.
Also, I had no luck on my cingular 7290 until I upgraded to OS 4.xxx
Important info on using Cingular 7290 as Modem http://blackberryforums.com/viewtopic.php?t=2066