Apple may block push notifications for unlocked iPhones

A company called PoweryBase recently noticed that some users were having problems with its NotifyMe app, which allows uses to set reminders that are pushed to an iPhone at a specified time. It was able to trace the problem to users that had unlocked their iPhones to work on a different mobile carrier, which may actually be by design on Apple’s part.

The problem stems from how the push notification service works with Apple’s servers. An application that uses push notifications will attempt to register with APNS on launch. The APNS will respond with a unique token that allows notifications to be routed to a specific phone. However, APNS simply does not respond to a registration request from a phone with an unauthorized unlock hack. If an application isn’t coded to time out after a certain period of waiting for the APNS request, it will essentially appear to be locked up, waiting for a response that will never come.

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