[Tex-Con-Man]

You cannot remove “noise” from “content” in a recorded file. There is no way to separate them.

You can only reduce it's effect. If you become too aggressive in trying to reduce noise, you will change the acoustic characteristics of the word you're actually trying to clarify...meaning, you could easily change the vowel/consonant sounds of a word when eliminating noise.

[avacado]

"You cannot remove “noise” from “content” in a recorded file. There is no way to separate them."

Nonsense! I do digital data processing of seismic data for a living. We remove noise all the time with band-pass filters. The cell phone noize would have a certain frequency range and can be easily removed.