Contacts+ is integrated with Skype and supports several additional VoIP apps. When you open a contact that is your friend on Skype, you should be able to see an internet call or SIP title in the info card (touch the see more button to expand the view). If the friend's Skype username is available, touching that row will launch a Skype call with your friend. Note: the Skype app must be installed on your phone, and after you signed in you'll need to sync your contacts with Skype (see Skype settings for more info).