Skype’s privacy settings let you control friends and others who can contact you. This helps you manage your conversation easily. You can change your privacy settings to block unwanted calls or spam messages or unblock them if you think you have been too harsh with them.
Unblock a person on Skype

  • Go to ‘Tools’, choose ‘Options’.
  • Move to the Privacy section > Blocked Contacts.

  • The block list should appear to the right.
  • Select the contact of your choice and click on "Unblock this person".