[fred_dj]

Here we go:

You should go straight to a Registry editor, and find:

HKLM > SOFTWARE > Arcsoft > Arcsoft MMS UA > Config > mm1

There you have a Five digit number folder and another one called WspHeader

Start from the Five Digit. Mine is 96545

Gateway: mms.metropcs.net
Gateway Port: 3128
MmscURI: mms.metropcs.net/mmsc
Name: MPC

Now goto WSpHeader:

There you'll se a key calle X-Alltel-MDN or X-VZW-MDN whatever was the previous carrier. Edit the Key and Rename the Value to X-MPC-MDN, make sure your 10 digit phone number is in this key as well.

Now, Goto HKLM > SOFTWARE > Arcsoft > Arcsoft MMS UA > Config > UI

Change the key called Domain to : mms.metropcs.net/mmsc

And that's it. That's what I did and it worked.

PS: If you have more that one five-digit folder in the above registry, is because you have more than one MMS server in your arcsoft software. Go there and delete them. leave just one. Let me know if works for yall too.