Telecom: Add sensitive phone numbers hooks

Change-Id: I809ceb65d7e188eb09dd4d85b5fdd716c63c60ef

Telecom: Convert to using singleton class

* SenstivePhoneNumbers is now a singleton, so change the
  calls accordingly

Change-Id: I6377f42e4b9c11c0e74345cc65d50476d3c911ba

Telecom: Adapt to the new location of SensitivePhoneNumbers

* For an explanation, see the other patch(es) of the topic

Change-Id: I45f2372dcf3aa20a2606bfb91e3763e2e372d0fc

Change-Id: I49406eb14a7df6e714b6a0948444173285904983