At the dialer screen I do not receive the option to call using regular number, Skype or Viber.
How can I fix this so that I'm prompted when I want to make a call?
Any suggestion would help me a lot.
Best wishes, Martin
Try Sky Dialer for Skype App, It lets you make Skype calls to your android contacts without merging the contacts with Skype (It requires the Skype app to be installed to work), lets you mark and organize favorites for easy calling too.
Full Disclosure: I am the app's developer