No sim detected topic

Setup
Samsung S3 on Verizon SCH-I535
Slimkat 4.4.4 build 8262
TWRP 2.8.4
Baseband I535VRBLK3


Problem
Unable to detect sim

Here's the skinny.
I have an iPhone 5s with a sim adapter.
Everything is working great as far as custom ROMs go.
I've tried cyanogen, PAC rom., and I've landed on slimkat as my favorite.
I get no sim detected on all ROMs.

I even went to Verizon to officially activate my s3 with an official Verizon sim and I still get no sim detected.

Any thoughts?