Yes, it is possible to search by phone number in the CRM, Candidates, and Resources modules.
From each of these modules, click on the advanced filters to select "Phones" in the Nature of key words.
Then, type the phone number in the associated text field!
Tip:
It is more effective to search only for the end of the number! For example, suppose the number +(33)1.30.20.40.50 is saved on a profile, searching for 204050 will succeed, whereas searching for 0130204050 will fail...