The PRO and ENT notifications are denoted by the service offering from your mobile provider. The Blackberry's can be configured to work via a BES, your scenario, or for use via email from the provider. If the device has been configured for use via the provider, which I have had when they have been shipped out, you are unable to activate them properly. Wipe the handhelds you are having problems with and then retry. If this does not resolve the issue then contact your provider so that the SIM service is set-up for BES not for their mobile service offering.
Hope this makes sense and helps
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