CID: Name Not Found. Number 408-137-9955. Just like what SOR said above, it's probably the same operation switching from their old numbers to new. Here's my break down of what I think are related numbers to this one and with the same CID. The operation uses repetitive numbers which is why I think it's the same hole in the wall, on top of which all the numbers begin with 1. How many prefixes use 1, I wonder?
408-159-5655
408-168-9974
408-164-7558
510-187-4455
408-196-5365
408-144-5365
If what I conclude as being the same hole in the wall operation, they have been calling me (using the various numbers listed) and getting no one on my end (including my voice mail because it's off) since 9/24/14.
Got the first "NAME NOT FOUND" from this number on 02/13/15, and, of course, didn't answer but blocked. The Second time just showed up on the blocker a few minutes ago.
Very likely one of the 408-using scammers having switched from the old "well-used" previous numbers to this and many other new ones that have showed up lately.