WHY cdma are not use in large manner as we use GSM?

Depends on where you are. In the U.S. CDMA is far more prevalent. The main advantage of GSM is it uses SIM cards which gives you much more flexibility than a phone that is locked with your carrier.

With a multiband GSM phone you can replace your SIM card and use the same phone in different countries that use compatible technology. Othewrise, CDMA is a better technology.

I'm not sure that DCC is correct. GSM was the selection of 200 countries in the world. CDMA was the choice of 2 countries.

I cannot believe that 200 countries chose a poorer technology. GSM has 85% of the international market, and CDMA has about 15%. The two (actually three, TDMA exists as well) technologies are different approaches to the way that the signal is split and transmitted over the radio.

Basically, they all allow multiple sessions to share the same frequency, meaning that the mobile company splits according to different criteria. TDMA = time division (time sharing)CDMA = code division (splitting and spreading across spectrum, which is more effort for the phone, and causes shorter battery life)GSM = builds on and expands TDMA and adds other features and capabilities.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.