Who called from 2132712852

Trying to find out who and why calls me from this phone number.

Caller Id:  California,No Message!

(213) 271-2852
Type: Land Line
Provider: MCI Worldcom Communications Inc
Location: Los Angeles, CA
Due to number portability, some numbers have been transferred to a new service provider.
Type: Land LineProvider: MCI Worldcom Communications IncLocation: Los Angeles, CA

Phone rings once from 213-271-2852 every half hour or so.  Does anyone know who these people are?

(213) 271-2852
Type: Land Line
Provider: MCI Worldcom Communications Inc
Location: Los Angeles, CA
Due to number portability, some numbers have been transferred to a new service provider.
Type: Land LineProvider: MCI Worldcom Communications IncLocation: Los Angeles, CA