We are planning to develop the push notification service for a telecom operator. But I haven\'t got any information whether the APNS push service is free of cost or should w
As mentioned above, Apple does not charge for the APNS However, you need to maintain a 3rd party server for that, and sending notifications to millions of devices would require a lot of work from you. There are some very good industrial solutions for iOS push notifications service that use APNS:
Diclaimer - I work in PushApps and also use their product in my applications for over a year now.