If you have physical access to the device, it's probably cheaper/easier to modify it, replacing the antenna with a load to ground. And if you're going to do tha

If you have physical access to the device, it's probably cheaper/easier to modify it, replacing the antenna with a load to ground. And if you're going to do that, you could probably negotiate with the provider to sell you a cheaper one with no LTE radios. I'm probably thinking of larger B2B though, individuals/SB probably won't have the expertise/influence