@Delhiboy 1000
CDMA begins with a far more restricted bandwidth per phone call than a landline does. When you speak into your phone, it is digitized, but then it is passed through a lossy compression device called a codec. The codec algorithm is specifically designed to take advantage of the fact that human spoken language is enormously redundant and that the human ear can compensate for certain kinds of distortion.
CDMA2000 1X for Voice and Data
CDMA2000 1X technology supports both voice and data services over a standard (1X) CDMA channel, and provides many performance advantages over other technologies. First, it provides up to twice the capacity of earlier CDMA systems (with even bigger gains over TDMA and GSM), helping to accommodate the continuing growth of voice services as well as new wireless Internet services. Second, it provides peak data rates of up to 153 kbps (and up to 307 kbps in the future), without sacrificing voice capacity for data capabilities.
If you can process data at 144kbps from a maximum date rate of 153 kbps I do not think you are going to better that my friend
Brian