I am new to mobile phone development. I've been asked to develop a cross-platform app based on our software infrastructure' s WCF services (or web services if need be).

I realise that there are many cross-platform SDKs out there so I want to ask a few questions before trying to evaluate all of them.

My first question, is are the SDKs thick client, or thin client?

Let me qualify that question further. So, if I...