Has anyone figured this one out yet? The standard registry edits and cabs don't seem to work. The roaming only option doesn't show up at all.
Edit:
Figured it out. Looks like it needs to be done in two places. Here are the registry values, I'll probably make a cab later when I get home.
Edited edit:
Works with both Sprint and Verizon
Code:
[HKEY_LOCAL_MACHINE\Software\OEM\PhoneSetting\NetworkService]
"ItemCount"=dword:00000003
"ItemName1"="Home Only"
"ItemName2"="Automatic"
"ItemName3"="Roaming Only"
"ItemValue1"=dword:00000001
"ItemValue2"=dword:00000004
"ItemValue3"=dword:00000005
[HKEY_LOCAL_MACHINE\Software\OEM\InitProv\PhoneSetting]
"ItemCount"=dword:00000003
"ItemName1"="Home Only"
"ItemName2"="Automatic"
"ItemName3"="Roaming Only"
"ItemValue1"=dword:00000001
"ItemValue2"=dword:00000004
"ItemValue3"=dword:00000005