[markdb77]

it is recommended to flash back to stock sprint rom, get everything working, then flash to a custom rom

you need your MSL code (master subsidiary lock) - call sprint and get it or use other methods posted here

dial ##<mslcode>#
ex. ##123456#

click EDIT
enter in your 10 digit phone # for both fields.
save, exit
in winmo
goto settings, system, profile update

OR

you might have success staying with custom rom and installing the sprint carrier cab and PRL/Profile update cabs.