Anyone can do this.

Ekata reverse phone is a plugin inside the twilio plugins directory (or whatever they are calling it this week).

I wrote a unix command named 'lookup' which takes a single argument (phone number) and spits out "associated people" in a nice yaml output:

            "is_commercial": false,
            "associated_people": [
              {
                "name": "Ms. Amanda Joy Lastname",
                "firstname": "Amanda",
                "middlename": "Joy",
                "lastname": "Lastname",
                "relation": "Household",
                "id": "Person.02884d55-980e-450c-a1e2-99999999999b"
              },

I haven't checked but I'll bet I could get API service (for a fee) from Ekata and query these person IDs they are using and then fill out a whole social graph.

It's a neat trick but other than confirming mobile=true and carrier:

    "carrier": {
      "mobile_country_code": "311",
      "mobile_network_code": "489",
      "name": "Verizon Wireless",
      "type": "mobile",
      "error_code": null

 ... I haven't found much use for it.