As a blogger, you will be using many different products or services. There will likely be time when you will need to contact support. Companies have various ways to provide support to their users among which will be via email, support tickets, live chat or phone with many offering toll free number.
To be able to call land lines or mobile phone you will need to add funds to your Skype account to get credit. I have done this and have been quite satisfied with it especially as the cost is way below what I will have to pay to call using my land line or mobile phone direct.
But a very good piece of information is, even if you don't have Skype credits in your account, it is still possible to call toll free numbers. The following countries and number ranges are supported and are free of charge to all users. We're working on the rest of the world:
France: +33 800, +33 805, +33 809
Poland: +48 800
UK: +44 500, +44 800, +44 808
USA: +1 800, +1 866, +1 877, +1 888
Taiwan: +886 80
For help on dialing please visit Skype user guides.