You’re conflating two things. One is GPS, which is designed to stop functioning above 1,000 knots to prevent it from being used in a missile.
The other is the interference of which I spoke having to do with electronics like cellphones that operate at harmonics that overlay frequencies used by aircraft navigation systems. It can be demonstrated that they do indeed interfere, but so many things have to happen to make the interference happen it’s wildly unlikely. So many things have changed over the years that prevent this from happening, like cellphones operate at lower power, personal electronics are better shielded, and operate at lower power. On top of that, the aircraft’s RF and EM shielding would have to be damaged in just the right spot, and the electronic device would have to be right near the damage.
As far as cell towers go, most phones are too weak to make a good connection from all but the lowest altitudes, and you’re moving fast enough that it can’t handshake the next tower and negotiate the connection quick enough to have a good connection except maybe st the slowest speeds and altitude on approach for landing.
I did a minor study on this exact subject, but it’s been decades, so the details are fuzzy.
You’re conflating two things. One is GPS, which is designed to stop functioning above 1,000 knots to prevent it from being used in a missile.
The other is the interference of which I spoke having to do with electronics like cellphones that operate at harmonics that overlay frequencies used by aircraft navigation systems. It can be demonstrated that they do indeed interfere, but so many things have to happen to make the interference happen it’s wildly unlikely. So many things have changed over the years that prevent this from happening, like cellphones operate at lower power, personal electronics are better shielded, and operate at lower power. On top of that, the aircraft’s RF and EM shielding would have to be damaged in just the right spot, and the electronic device would have to be right near the damage.
As far as cell towers go, most phones are too weak to make a good connection from all but the lowest altitudes, and you’re moving fast enough that it can’t handshake the next tower and negotiate the connection quick enough to have a good connection except maybe st the slowest speeds and altitude on approach for landing.
I did a minor study on this exact subject, but it’s been decades, so the details are fuzzy.