High complexity, low volumes, I would imagine. A few of the answers below talk about it being a car part but SDRs that can do 3G/4G are targeted at people deve

High complexity, low volumes, I would imagine. A few of the answers below talk about it being a car part but SDRs that can do 3G/4G are targeted at people developing cheaper chips. Electronic test gear is much more expensive than cars (at least at the bleeding edge), so the pricing doesn't preclude it from being used there.