You can download skype software here and start to make a call through internet. What you need to do is plug in a microphone and earphone into your computer. Before you phone from skype to skype and it is free. You need to know your friends’ usernames and put them into your contact list. From the skype window, you can see whether your friend’s skype is online or not before you make a call.
You can phone from skype to landline. The phone rates to different countries can be viewed on the website. You need to have credit on your skype in order to make a call to landline. You can do that by electronic transferring money to the skype from your bank account.