Digital and Analog Mobile Phones

Today there are two sorts of mobile phones: digital and analog

analog phones use the Advanced Mobile Phone System or AMPS;

digital phones use the Global System for Mobile Telecommunications or GSM.

The main difference between these two systems is how the voice signals are transmitted:

analog signals are continuous and transmitted by frequency modulation

digital signals are made of pulses and transmitted in packets and use a special type of digital modulation.

Digital systems have better speech quality than analog systems, but they need more computer power.