Are you able to send email when you are connected? Just trying to find out if only the IE is affected. The Yahoo! 2.0 Go is not the greatest test because it doesn't work for some people on WIFI just like Live Search. BTW, the Yahoo! 2.0 is no longer in "beta" and can be downloaded. They are technically not browsers. Have you tried to delete cookies/history/etc. in IE?
There isn't much more you can do to IE in terms of settings. Maybe a Cricket person or forum would be a better resource. VZW worked right away.
You can also try Opera Mini (free):
http://www.operamini.com/download/pc...ovox_ppc-6700/
to see if it is your browser. Alot of people like the Opera (full version).