Yeah, you're both right - I was at my desktop when I tried it - worked OK - but not on my android. Thanks for the feedback.
It is easy to add a clickable link to a phone number in Evernote; just select the phone number, click on 'Format' on the top menu, then on 'Hyperlink, Add...' - An 'Add Link' box will open with an 'Address:' box in it, with the text 'http://' already entered. Just click on the OK button, and your phone number should turn blue and be underlined. This is now a clickable hyperlink to your phone contacts, and will ring the number if clicked. Hope this helps.