Thinking of getting an ipad mini with Skydemon for navigation.

I understand I would need the cellular version and so I have some questions:

Would I need a mobile phone contract to use my skydemon navigation?

When in use would the ipad mini receive phone calls etc.?

Would there be any other cost apart from the skydemon subscription?

regards John

Glad I've seen this, as it covers my question also. I note SD have now dropped the Mobile MD which was the platform I was tending towards when I buy post qualification. So I'm now thinking Ipad Mini for me, but is anyone able to say which option gives the better GPS reception, Ipad with 3g or Ipad with external GPS receiver?