@Squatting Hen I sure hope the canned response that HTC is giving is accurate, but it's not in their best interest to offer "prepaid" solutions in their setup software. The majority of people purchasing prepaid service either got the Titan free from the Microsoft Event or are purchasing it used from someone that upgraded to a newer device. HTC doesn't make a dime off them.
I'm more inclined to believe the HTC rep that I have been chatting with who says that they are aware of the situation and are "working on a solution" - which we all know means "we know you can't do it and we might, maybe, but not really, come out with a solution some day..."
Here is the email that I received regarding Connection Setup Changes from HTC Dev:
"I understand you want to add the MMS settings for the service provider that you are using on your Windows phone 7. You should be aware that your service provider is not on the list. We are aware of this issue and are working on a solution so you can make configuration changes. Unfortunately, I do not have an estimated time for the release.
If you need further clarification, I would like to offer a call back concerning this issue. I would need you to send a contact number (preferably a landline) along with a date and time that works best for you. It would be helpful to know what time zone you live in currently. I apologize for any inconvenience that you have experienced."
So, there is no mention of August for an update, only that they are working on it... Hopefully they will have an update next month and I will be completely wrong, but I'm betting that Connection Setup is done and Windows Phone 8 devices will be rolling out in October/November...