[TOOL1075]

Okay guys - I figured it out. Well, I didn't figure out how to get that original dialog box to come up, but I did figure out how to make it auto-configure.

You can only add a new GSM connection type when in GSM mode. By default, in the "Select Networks" dialog of the "Advanced Tab" of the Connection Settings, you can pick from:

Sprint
My Work Network
My ISP

When you try to make a new connection under "Sprint," you can't make a GSM connection entry if you are still in CDMA mode. So, I ended up making a separate AT&T entry when I switched to GSM mode, so my new list looked like:

AT&T
Sprint
My Work Connection
My ISP

So, no auto-switch. I had to go back in here and switch to AT&T to enable data on GSM.

Then, I realized I should have just made a new GSM entry under the EXISTING Sprint category. (I didn't do this before because I didn't try to add a sub-connection under Sprint when in GSM mode. I only tried in CDMA mode, and you can't enter an APN there, etc).

So what I have now is:

Sprint
My Work Network
My ISP

and when I edit the "Sprint" connection, I get the following choices:

Auto pick
Sprint
AT&T (this will be whatever you name your new connection sub-entry)

So, I set it to "Auto pick" and it works!!!!!!!!!

I will be traveling overseas next week - hopefully I won't have trouble with the SIM cards I will be using.... the fact that the dialog box no longer shows up troubles me....