I gave this presentation at the Operator API seminar at MWC14. To some degree it is based on a global developer survey which we conducted to better understand how developers perceive the value of operator APIs and services.
You can find a blog post with more details, the slides and links to the white paper "The Value of Operator APIs for Developers" here: http://manfredbo.tumblr.com/post/78755173151/operator-apis-what-developers-think
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Please allow any developer to engage with the MNO platform without signing complicated agreements.
Document the platform and its APIs without signup; provide test/sandbox servers and ways to test an app without signing an agreement; write example libraries and put them on github.
Developers make the platform vibrant, and developers are not interested in engaging in a "partnership" model;
Allow anyone to work with your APIs and then they will do so.