Contact card on T55A mobile number visibility

[stefanc]

On the T55A we can see the contact card of users.
For some users we can see their e-mail, phone and mobile numbers on the contact card, but for other (most) users only the e-mail shows. In both cases the phone and mobile number is defined in Active Directory. Any idea why the phone an mobile number is not visible for all users?
We also noticed that if we retry looking at the contact card days later we can see the phone and mobile numbers. If we look on another phone however where we did not search on that user before, these numbers do not appear.