Received three calls recently.  Answered none of them.

3:47 EDT sep 29
2:55 EDT sep 28
9:50 EDT sep 28
2009

(415) 508-3268
This is a magazine/trade publication fulfillment call and data center.
What that means is if you receive a "free" trade publication, when it is time to renew this company will call you to insure that all your contact and job information is current.
I receive about 15 free trade publications and they are extremely important in my day to day activities. These publications put me together with companies that supply items I use in my day to day job. For example, if you are in the IT or web industry, the publications cover new server technologies and all different types of new hardware and software with the ability to get additional info and quotes very quickly.
There has got to be over 500 of these magazines published every month in over 200 fields of industry, everything from dairy farming to oil production.
Because I have requested some of these magazines, they can call me without regard to the "Do not call list", because I deal with them or the magazine(s) they represent.
All they want to do is to verify your contact information so that the magazine doesn't go to the wrong person and gets throw away immediately.
Unfortunately, the least expensive way for the publishers to contact the database, is by using offshore, (mostly India), companies to place the calls. In addition, many of us in the USA equate a call out of nowhere with an Indian voice immediately with something really annoying when in fact they are just trying to collaborate your mailing information.
So before you get all annoyed, try to think if you or someone else at your phone number gets or has gotten a trade publication.
Oh, and one other thing. Many companies will give all the correct mailing info to get the trade publication for free. But when it comes to a contact phone number, they give out phony phone numbers, (so they never have to deal with a caller), and with the luck of the Irish it may just be your number.

have had numerous calls, at least once a day.

i answered this number once.
they were asking for my brother in law.
he obviously owes somebody some money, since he has been laid off, and moved to another state.
i advised my brother in law of this, and has no idea. (of course he owes everybody money)
evidently they have paid money to access all his family information, and are stabbing in the dark that my sister is married to him.
why they think that they can get in touch with him through me is beyond me.
i told them that i didn't know him, and this was my private cell # , to NEVER call me again, but they keep calling.

So my cellphone is tied to my home IP address?  That's a stretch...

You might want to add an additional layer of tinfoil to your hat.