See what kind of radio you have in there - if it's 3G then you're already set since it's likely been sunsetted.
This applies to 4Runner's but the gist may apply.
2019 and earlier MY have a 3G radio and that's gone.
2020+ have a 4G radio that should be disconnected via phone call first before hardware mods.
Disconnecting the antenna on that vehicle only reduces cellular range but there is also a fuse that can be pulled but that will be very model specific so checking your manual/fusebox/online documentation may help. (in Toyota's the only side effect is loss of microphone use for in-car calls)