Who called from 3604614696

Just got a call. Hung up when I answered, when I called back was a rapid busy tone. Who are we dealing with???

Got this called on my cell? If I don't know them I'm not picking it.
Bill collector? I've put it on "no ring" option.

Weird I got a call too but I  never answer numbers I dont know. And from the looks of it this "person" is calling a lot of people very fast.

Weird I got a call too but I  never answer numbers I dont know. And from the looks of it this "person" is calling a lot of people very fast.

Just got a missed call from this number... my phone didn't ring though, I was using it at the time that I would have gotten the missed call.  Very strange