said by lotus91 :
I want to transceive data between my pc and a mobile phone ...
Are are trying to "transceive" between 2 PCs using mobile phones at each end? Or between a PC and a mobile phone as you wrote? There is a big difference.
If there is no alternative to data-over-voice (such as GPRS) ... get an expert to modify and compile soundmodem
source code for whatever OS is running on your PC (and perhaps your mobile phone).
If you explained in more detail the exact problem you are trying to solve, I am sure you will get many more suggestions.