From Lucky Communications:
Click-4-Net Phone is a beta version for PC-PC free calls over Click4prepaid network. Log in from anywhere in the world and allow someone to call you on your PC from their phone at rates as low as 2 cents per minute. Make prepaid PC-to Phone calls too. Works just like a cell phone from your computer for as long as you have Internet access. Add your buddies to your list and instant message them for free. Version 1.12 may include unspecified updates, enhancements, or bug fixes.