Which U.S. cell phones disable their internal antenna when you plug in an external antenna? (Disabling RF port)

Which current U.S. cell phone models disable their internal antenna
when you plug in an external antenna? I can't seem to find any info on
which current models have this feature
(called a Disabling RF port), but I'd really like this feature to be
on the safe side, especially in the car.

Thanks in advance for any info.

Joe