Re: Altimeters
Assuming there's a real problem*, it's still probably unimportant outside airport range because the planes will be much higher when flying over that area. The towers are only located at ground level, so the signal strength would be much lower. During takeoff and landing, the planes will be much closer to towers.
*I am not an expert in this, but I have not heard any convincing explanation why this band would interfere with altimeters. Without technical knowledge, the mobile companies' statements seem a lot more logical.