Cancellation request message
With the Push Plus level of service, you can try to cancel a push message that you sent to all PINs or tokens, or to a subset of PINs or tokens. A BlackBerry device must be out of coverage range for at least ten minutes before you can successfully cancel a push message to the subscriber. Cancel requests are included with the Push Plus level of service. They are not available with the Push Essentials level of service.
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