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Antenna Point: PCB The point where antenna is connected is called antenna point. It is normally located at the top of the PCB of a mobile phone.
Network Section: The section below antenna point and above power section is PCB called network section.

Antenna Switch: It is found in the network section. It is made from metal and non-metal. It has 16 points or legs. In some mobile phones, the antenna switch is merged with PFO.
PFO: Power Frequency Oscillator. It is present PCB beside the antenna switch.
Network IC: It is below or beside the antenna switch and PFO. In some mobile phones, the Network IC is merged with PCB the CPU. E.g.: Nokia 1200, 1650, 1208, 1209 etc.
Power Section: This section is below the Network Section.
Power IC: In the Power Section, the PCB IC around which there are several brown-colored capacitors is called Power IC. In some mobile phones there are 2 Power ICs.
CPU: Central Processing Unit. In the power section, the largest IC is the CPU. In some sets there are PCB 2 CPU.
Flash IC: This IC is found beside the CPU.
Logic IC: The IC with 20 legs PCB is the Logic IC.
Charging IC: In the Power Section, the IC beside R22 is the Charging IC.
Audio IC: PCB The IC parallel to Power IC is the Audio IC.