Another observation:
I see that the UAProf is also under the following key in the registry:
-HKLM/Software/Microsoft/Windows/CurrentVersion/InternetSettings
I checked it against the OEM Sprint ROM and noticed that any and all placed the UAProf key is, it is set as
http://device.sprintpcs.com/HTC/PPCT7380SP/1216513.rdf
I am wondering if this may also be a key of interest as we know that Arcsoft used "The Internet" to connect and send MMS.
Here is a screen cap from the OEM Sprint ROM:
And here is one from the Juicy R5 test ROM: