Yeah, same here. I've never done it before, but I thought about forking the creator's tree from the commit before his radio changes and then incorporating any future updates (security patches, etc.) I'm making the assumption that we are both using the same ROM (by kentone and vince2678), of course.

The build I'm using right now is 20170828, right before Vince removed the prebuilt RIL (https://github.com/Galaxy-MSM8916/android_device_samsung_gprimeltetfnvzw/commits/lineage-15.0?before=dfd3be39f5ff063456495fe207050dc4e385bc1a+35). Everything works, but on the subsequent builds, I couldn't get it to work. The only thing is that my carrier is reported as Verizon Wireless. Doesn't bother me, though.

Seeing that you confirmed working modem/radio, I assume you got root?

EDIT:  I thought something seemed different... I read that you have the Straight Talk edition. I have the TracFone edition.

Alright guys, in the next couple days I should have a thread on rooting and installing a custom rom with working cellular.

I personally won't be able to compile until this weekend, and that's only a maybe. I have to overwrite my Antergos partition with Ubuntu for full build compatability.