Question

Explain what happens to the pitch of a cell phone ring when the wavelength of a sound wave increases

Answer 1

"Pitch" of sound is what we hear as the result of its frequency.

When the wavelength of any sound INcreases, its frequency DEcreases.

Answer 2

You get a more low sound.

Conversely, when the wavelength becomes shorter you get a more treble sound.

;-)