About Service Book for BlackBerry IM client (Yahoo messenger, Gtalk, AIM, MSN):
The IM client need BlackBerry Service to work. If you don’t have BlackBerry Plan is doesn’t work.
More info here
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Instructions:
THIS DOES NOT WORK FOR MAC USERS PLEASE BACKUP YOUR DEVICE. DESKTOP MANAGER IS VERY EASY TO FOLLOW FOR BACKING UP AND RESTORING!
- Download the Yahoo Messenger 2.0 service book
- Open Desktop Manager and restore it to your device.
- Manually register your handset with the RIM network via the HRT editor: Options > Advanced Options > Host Routing Tables > Menu > Register Now
- Load your own backup back to the device.
- Log into your BIS account (the same thing you did when you first set up your BB people!) and re-send service books
- Download Yahoo Messenger from mobile.blackberry.com
* If applicable, regenerate encryption keys for Desktop Manager or BES. If you’re on a BES, again, make sure your BES admin can create a policy allowing Yahoo IM traffic.
** If the service does not work right from the install, try doing a hard reset (pulling/reinserting battery).
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The Red text it mean you must have BB Plan
