Finally got it to work! The instructions on the simplemobile.webs.com site are incorrect(http://simplemobile.webs.com/index/O...FT%20FINAL.htm). In short, the configuration of the proxy server is not necessary - by removing the proxy config my connection now works like a champ!
Start and then Settings.
Tap on the Connections tab.
Tap on the Connections icon.
Tap on the Advanced tab.
Tap on Select Networks.
Tap on New…
In the Enter a name for these settings: field, enter Simple
Tap on the Modem tab.
Tap on New.
In the Enter a name for the connection: field, enter Simple
Tap on the Select a modem: drop down list and select Cellular Line (GPRS, 3G).
Tap on Next.
In the Access point name: field, enter simple and tap on Next.
In the Username: field, enter (blank)
In the Password field, enter (blank)
Tap on Finish.
Tap on ok three times.
Tap Edit my proxy server under "Simple"
Tap to check This network connects to the Internet.
THE NETWORK DOES NOT USE A PROXY
Tap to check This network uses a proxy server to connect to the Internet.
Enter 216.155.165.050 in the Proxy server field.
Enter 8080 in the Port field.
Tap OK four times.
Tap Start again.
Tap Internet Explorer.
Browse to www.google.com
Tap Tools and tap Options.
Tap Use Current under Home page.