Isn't That the Noise the Computer Speaker Used to Make When Your Mobile Phone Goes Off Near It?

The sound from the noisy is commonly associated with the old GSM network. Subsequent networks still operate at much higher frequencies, so we don't notice it occurring. The noise occurs when a mobile phone is measuring the signal strength and handing it off to different base stations while determining the best base station to connect to. While searching for the strongest available signal, the phone making the call tries to push through competing signals. This is why we hear and felt the pulsing or that noise that I played.