I know that Skype is really good for making free online calls to friends and family all over the world. I use it all the time. But sometimes I need to make a call to a landline or cellphone and Skype's rates are good, but a friend of mine told me that there were other companies offering lower rates. I tried two of them and the first one was good but the second one was better in terms of call quality to certain countries. If anyone's interested, here are the websites
Cellphone Add-Ons for International Calling 
Linear Mode
