There is a known bug in the phone app which when you click on a previously placed call/contact it only gives you the option to make a cell call. This bug has been set to fixed and will be coming in an upcoming release - I opened this a week ago in bugzilla and was informed that it was a dupe of another bug which had just been fixed! Hopefully it will come soon as it would be nice to be able to place a skype call from the phone app.

See: https://bugs.maemo.org/show_bug.cgi?id=8159

My bug was: https://bugs.maemo.org/show_bug.cgi?id=9330
(for confirmation of the fix and status)