(415) 447-5438

Received a line item charge for this number on my ATT phone bill. Not any number I would recognize. Line item reads: 7:19pm  Snfc Cntrl, CA    415 447-5438    Code: DBO         6.0 min.         $26.46.SNFC is a rate center in San Francisco owned by Pac Bell. The call was billed as collect, serviced by Custom Teleconnect.  Is it possible that someone used a calling card to place a collect call to my phone and the number shown as the source is the calling card number, not the original pay phone number or other originating number?