10-22-2012 08:03 AM
Welcome to BlackBerry Support Community Forums
First of try this in a sequence :
1- Register your Handheld .
2- Resend your Service Book
3- Then perform a battery pull restart like this while the device is powered On remove your battery wait for a min. then reinsert it back.
If that does not help go through this Knowledge Base article and see if that helps :
KB31837 : " Activation Failed.An error was encountered when sending the activation transmission " when activating a BlackBerry smartphone.
Try it and let us know.
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If Problem Resolves mark the post(s) as " Solution ", so that other can make use of it.