I think TandG is right… Mac OSX (and iOS too I believe) handle the cookies / session persistence directly. The problem for me was on Android - it didn’t manage the sessions, so my app has to store and repeat the cookie back to the server. (Session cookies I’m talking about).
I believe the session cookie was passed through to the app on iOS (pretty sure it was), and my code still copies and sends it back on iOS (despite iOS managing the cookies - don’t know if it filters my app cookie copy, uses it in place of the original cookie, or what). So, you probably will see the cookie on iOS.
On Android, you should see the cookie passed through to your app, but the OS will not automatically echo the session cookie back (not at the time I wrote my code for cookies anyways). In that case, you need to recreate the session cookie in the header and pass it back with your request. That’s my two cents anyways.