Skype is a great communication service that can be used for free. Skype is available on many different platforms and devices, and it offers free service. Skype is very user-friendly, and it offers a big variety of features for free. Skype can be used for free Skype-to-Skype calls, but SkypeOut service is not free and may be used for calls to landlines or mobile phones. SkypeOut service is not free. Skype is a very good video- and voice-calling service, but there are some disadvantages, for example the SkypeOut service is not free.