How to create user on mobile app for Django site?

What is the correct way to do the following:

1) Mobile App from which a user can create a user/profile on the Django site
2) Allow authenticated users to create on the site and query personalized data from the site

This is what I guess I have to do:

1) Create a REST API (probably with e.g. django-piston) on at the Django site for creation and authentication

How would I authenticate against the Django site?

When I use URL connections from the mobile app do I always have to send the credentials or can the Django site identify me by storing session cookies on the client just like as if the mobile app would be a browser?

Note: When I say mobile app I actually mean iPhone App for now, but there might be a Android version sometime in the future.

Thanks for any advice!

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