First, I guess this means that it's okay for Ralph Norman to urge the President to declare martial law.
I looked into this. It's been proposed since 2010, so there's more than once that the Republicans could have taken the bill out of conference. Why didn't they? They can have a vote NOW. Why haven't they?
Plus, it looks like the FCC has given the prisons the ability to pinpoint cell phones in the prison and have the carriers shut them down. So sounds to me like a fix. And they are asking the FCC to give them the ability to jam, so it's not a job for Congress, anyway.