mozilla-b2g/gaia — pull request #8729 by gtorodelvalle (2013-03-20 10:50:05+00:00)
Title: Bug 852515 - [Dialer] Inclusion of 'withheld number' instead of 'unknown number' (follow-up of 850170) (r=fcampo)

Basically, substituting the text "unknown number" by "withheld number" when the calling party is not making his phone number visible or available.