RIL from here could probably help
https://github.com/vmobi-gogh/android_vendor_samsung/tree/jellybean/gogh-common/proprietary/lib
idk how all that is done because i've never had to deal with ril before.
the matching build.prop lines are:
# cannot take spaces
rild.libargs=-d /dev/smd0
# Fields for custom RIL
# MAX PROP NAME is 31 chars --|
ro.telephony.ril_class=SamsungCDMAQualcommRIL
gsm.sim.operator.alpha=Virgin Mobile
gsm.sim.operator.numeric=310120
gsm.sim.operator.iso-country=us
gsm.operator.alpha=Sprint
gsm.operator.numeric=310120
gsm.operator.iso-country=us
ro.cdma.home.operator.numeric=310120
ro.cdma.home.operator.alpha=Virgin Mobile
ro.telephony.default_network=4
keyguard.no_require_sim=true
DEVICE_PROVISIONED=1
telephony.lteOnCdmaDevice=1
ro.config.svlte1x=true
dalvik.vm.dexopt-data-only=1
that gets ril working for galaxy victory on virgin mobile (cm10)