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Introduction to Mobile Phone Mobile Phone is a wireless device that emits RFR (radio-frequency radiation) to transmit data and allows people to communicate anywhere. It can be carried anywhere as long as there is a signal transmission. There are three types of Mobile coverage, which are: AMPS, GSM and CDMA
AMPS (Analogue Mobile Phone System) It is an analogue signal and system for transmit data and be used for mobile communication. The strength of this system is it has a better network coverage than GSM. However it is the most insecure mobile phone. This system is also going to be closed in Australia until end of 2000 as the government states that analogue signal make the frequency too crowded.
GSM (Global System for Mobile Communication) It is a digital system that converts from our voice to digital (pulse) and transmits it to air for mobile communication. The strength of this system is it is more secure than analogue system. On the other hand, the weakness is the signal is not as strong as analogue system.
CDMA(Code Division Multiple Access) It uses a digital systems but it is not pulsed as GSM did...