Push Notifications help

[Nighty]

I tried using Urban Airship for sending push notifications to the devices.
I register the device to push using:

[[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];

I created an app on Urban Airship, uploaded the certificate key and tried sending a broadcast with no success.
Only when I manually added the device token to Urban Airship, I successfully sent and got a broadcast.
My question is - can I use Urban Airship to send Push notifications without registering device tokens and how? If not, how do I register the device tokens automatically from the app (and not using the curl code)?
Is there any other push provider which doesn't require more than Apple's basic registerForRemoteNotificationTypes: method?

Thanks!