Why the GSM mobile signals are distrub the TV's and audio systems while receiving and making calls?

Question

At the same time CDMA mobile signals will not distrub?

Answer 1

Well, the phone is a transmitter. The radio signals induce currents in the phone/TV.

Answer 2

I think you are talking about the Blurps you "hear" in your speakers. The problem is speakers are not shielded so they pick up energy from outside sources. In this case GSM is at a frequency that speakers pick up and transmit as audible sound.

You might notice that it is not always when making a call, it is also when you cell phone sends messages to local towers, you will here a BLURP or two.