Mobile phone uses: 

The correct answer is Full duplex.

Key Points

• A full duplex communication system allows communication in both directions simultaneously.
• Mobile phones use full duplex communication to allow users to speak and listen at the same time without any interference.
• In a full duplex system, there are separate channels for sending and receiving signals, enhancing communication efficiency.
• Examples of full duplex communication include telephone networks and modern mobile networks.

Additional Information

• Full duplex systems are more complex and expensive compared to simplex and half duplex systems.
• Full duplex systems minimize delays and improve the quality of communication.
• Other examples of full duplex communication systems include Ethernet networks and certain types of radio communication.
• In contrast, simplex communication allows transmission in one direction only, and half duplex communication allows transmission in both directions, but not simultaneously.