Hi Abdelkhalek
Have a look into this forum and KB's:
http://forums.crackberry.com/native-blackberry-os-apps-f152/pgp-unable-find-universal-server-keys-757379/
Configuring BlackBerry Devices to Work with PGP Universal and BlackBerry Enterprise Server 5.0.x
http://www.symantec.com/business/support/index?page=content&id=TECH199169
--snip--
If you do not have a PGP Universal server or if you are using, a CKM key (CKM keys are not stored on PGP Universal Server), send an email to BlackBerry device with your keypair attached to an email, as this keypair will be used as a part of PGP Universal enrollment process. If you have a PGP Universal Server, please note that PGP user accounts will NOT be created on PGP Universal Server when enrolling from a BlackBerry device. Hence, you must create internal user accounts on PGP Universal Server prior to enrolling a BlackBerry device to use PGP encryption. For creation of internal user accounts on PGP Universal Server, enroll through bound PGP Desktop client or upload the keypair to server prior to further actions.
Do you use CKM keys
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also
Configure the BlackBerry Enterprise Server for use with the PGP Universal Server
http://www.symantec.com/docs/HOWTO59333
HTH