Skype to Skype calls are free anywhere in the world. You can use Skype on a computer, mobile phone or tablet*. If you are both using Skype, the call is completely free.
Users only need to pay when using premium features like voice mail, SMS texts or making calls to a landline, cell or outside of Skype.
*Wi-Fi connection or mobile data plan required.
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How much do Skype calls to a mobile device or landline cost? 