The smart tapping identification model without installing a control program in modern wireless communication

There are many fairy tales of wire tapping a phone without installing a control program. Many newly minted spies claim this option. Unfortunate marketers advertise their products to intercept other people's conversations and SMS. But that phone's GSM network is protected and can't be hacked without special equipment and is usually silent. And easily giving in to such tricks, uninformed Internet users eagerly listen and spend money. All traffic mobile operators encrypted with a complex algorithm. It does not take much effort to intercept it, it is enough to stand in the way of this signal (near the speaker) with a signal receiver, and however, to decrypt the protected information, you need to get very expensive equipment. The level of technical knowledge in cryptography and equipment is simple, but so expensive and bulky that you can't be mobile enough. In general, everything here is at the level of professionals, which means that it is not available to the masses..