this will enable the roam option under start>settings>personal>phone [CDMA Service tab] then 'Roaming'
registry edit/add:
Code:
[HKEY_LOCAL_MACHINE\Software\OEM\InitProv\PhoneSetting]
"ItemCount"=dword:00000003
"ItemName3"="Roaming Only"
"ItemValue3"=dword:00000005
or install the attached cab.