Constantly getting calls from the number 64?

Maybe someone can shed some light on this oddity. On Thursday 8/1/13, Friday 8/2, and today, Tuesday 8/6 (nothing over the weekend or Monday) I have been receiving calls from "64" on my iPhone 5, AT&T service. I received about 7 or 8 calls, all during business hours so I missed most of the calls. I did answer it once on Friday, and here's the weird part - the second I picked up and said hello my phone immediately starting ringing some random number as if I was the one making a call, then a girl with a mid-20's sounding voice picked up and said "hello?"… I said "hello? Who is this? Hello?" And she hung up as if she did not hear me.

I also texted the number thru my missed call log and said "what the hell is this?" And of course did not get an answer.

Anyone know what this is? Some kind of weird phone virus? Was the girl on the other end of the line experiencing the same thing as me? When she picked up did her phone call ANOTHER random number? Or is she in on the plot?

Strange, no?

Call or go to the nearest AT&T store. They should be able to help you.

Looks like the caller's pulling pranks on you. That "64" is a spoofed number.

Like what was discussed at http://www.callercenter.com/articles/calleridspoofing.html caller ID spoofing enables the nuisance caller to mask his real phone number from appearing on your caller ID. However, be aware that you can simply refer the call to your telephone service provider. The rep can look into your account in their database and find out who's behind the calls.