Why is the network expansion of CDMA much fast/cheaper than GSM?

Question

(1) I have seen CDMA fixed phones lines. But I heard that it is a technology that should be used to mobile phones?

If so why arent our mobile phones on CDMA?

(2) How do you compare CDMA to GSM? They say setting up CDMA towers and expanding coverage over a large area is much easier, compared to GSM. Please explain

(3) Whats 'spread spectrum communications' and how is it related to CDMA and GSM?

thanks :)

Answer 1

Get the detail description in wikipedia its very big to explain here...