A little toy the Consultants use. Check it out. Text is quoted from the Book of the Wyrm.

Fetish: Umbraphone
Level 1, Gnosis 3

This is a common toy among the Consultants camp of Black Spiral Dancers.  It seems to be a simple black cellular phone, but to those who know how to work its numerical codes, it can be used to make calls to and from the Umbra. Naturally, this can make a Dancer's Rolodex a worrisome thing indeed, as there's always the possibility of finding a direct line to someone like Lady Aife - or worse. The Glass Walkers have developed their own version of this fetish, although other tribes rumble that they might have been taught the secret by the wrong teachers...