Lol this sounds quite strange and yea ive heard bout this before.

Not sure but its not unusual that you get an unknown call.

I_HIJACK wrote if you got a poster which looks like the front cover of black ops with the guy with the dual pistols there is a number on the bottom left if u call it it is unknown but it makes a noise over and over the noise is the magic box noise when u open it it shows that zombies is there but i dont know if this is it but if it helps then yer

that would of been kinda creepy if I would of answered and a magic box would have played

alright im back after a few hours lol. i found the code and got the wallpapers but never got a call. maybe it takes time. who knows.