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Basically the communication in the wireless world between 2 people can be accomplished by dividing the medium into time or frequency or codes.
If you assign time slots to a user then it is TDMA.
If you assign codes to user then its CDMA.
If you assign frequency slots to users then its FDMA
As far as security is concerned CDMA is best as when a code is assigned to a transmitted signal only the receiver whose frequency response is programmed with the same code can actually be able to intercept the signal.But the fact that CDMA phones don't work in multiple countries is a major negative point..
The market share and popularity does go in favour of GSM.
Even the way SIM works for GSM and the way it works for CDMA varies.The fact that a GSM SIM can be easily swaped from an old cellphone to a newer one with your data intact but incase of CDMA phones since all contact information gets stored in the operator's database so it works fine if the operator service is the same one.
Well that again has a positive point with CDMA phones as incase the phone gets stolen there is always a way to recover the lost contact information.
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