Skype

Skype can be used to keep in contact with other skype users. This is a free, yes free, contact system. All you have to do is go to to http://www.skype.com and register, then just ask your friends for their online number and talk to your hearts content. Your calls are not limited to skype participants but also pay a small fee, you can pay as you go or have a monthly plan. Packaged in a neat and user friendly aspect with many features, you get great value calls, people can contact you on your online number, leave a message in voice mail, you can send SMS messages or have your calls forwarded to you phone when you are off line. An efficient way to do your netwoorking having all of your contacts in one spot.
Ref:http://www.skype.com/intl/en/features/