Is it possible and if it is please reply because i really need to find out what to do to get it on my phone with only windows XP

Hi, I am just trying several VOIP applications on Windows Mobile 5.0 and I am facing a problem in the clarity of the voice while am having a gr8 connection bandwidth a gr8 software like SKYPE. By researching and visiting different blogs; I am finding some people assuring that Windows Mobile 6.0 is comming...