Ok, I know its possible to get a number to be callable with Skype using callto:, and I know its possible to get a number clickable on iOS and droids by using tel: in an a tag.
However, what about tablets/iPads? Does this work for them?
What if they have Skype installed on their iPad and click a tel: link.
I believe you cant make calls from an iPad or droid tablet even with a service plan (I dont own either, just an assumption. Enlightenment would be great). Would callto: work for a mobile browser to make them use Skype instead (if installed, obviously)?
No, it would not work. The way Skype accomplishes this on a desktop is through an extension installed in the browser. On an iPad you cannot install these types of browser extensions. It may be possible on an Android tablet.
Edit:
My answer is based on the assumption that you would visit a page with telephone links and you are asking if the browser will perform like it does on a desktop. Where the browser will 'rewrite' tel: tags you use Skype if installed.
Edit 2:
Updated answer to reflect @ceejayoz's input.