this is what i do...
http://ppcgeeks.com/verizon-mms-step...led-t4470.html
you have to do the reg edits, you have to make a new #777 connection and you have to change the MMS settings. then...it works. make sure you add the X-VzW-MDN as a string not a dword or it wont work. i have had 3 phones now and always works each time.