Who called from 5200000000

i just got a call from 520-000-0000 i didnt answer it but im wondering who is calling all of us so far its only happened once to me

got 2 missed calls on the cell phone and the number shows up as a 12 digit no. (520-000-000000 & 529545826002).  No voice mail message left.

i just got a second call from the strange number 520-000-000000 on 12/24/07
the first call was on the 12th, not sure if they are doing it on a time schedule or not of once ever 12 days or if its just a coincidence, I'll have to just wait and see if i get a call in 12 days or not

i didn't answer it obviously. The number popped up as 520-000-000000

520-000-000000 -six zero's on the end!