Is there any cost for using the Push Notification Service?
I know it requires using my own server to send notifications, but the signals are passed through an Apple server. There are no server transfer fees?
No, there is no cost. The only "gotchas" are that your app has to be in the app store(i.e. no jailbroken apps), and you have to maintain a server for pushing the events.
If you are building you own push server, which you mention above, there are hosting expenses and the cost of time to set up and administer it. Alternatively, you can use a service like iLime (www.ilime.com), which provides a RESTful API and a lot of free push alerts up-front to handle the server infrastructure for you.
Disclosure: I work for KeyLimeTie, who produces iLime - let me know if you have any questions.
Best wishes integrating APNS into your app, however you choose to do so.
Tim
来源：https://stackoverflow.com/questions/2144678/is-there-any-cost-for-using-push-notification-service