Always when my Girlfriend in Germany calls me, I see this number or 4082760000 on my cell...
So this is only a routed number...
I don't know why this number appears on my cell... maybe the local telephone company uses VoIP and in this Area is a centrum over which the calls go back to the landline or whatever...
I got a call from 408-715-4900 twice, first showing the ID and second time (immediately) without the ID. I chose not to pick up the phone because I did not recognise the number.