unknown number calling

They keep calling every few hours and everytime i answer it hangs up if i call back it says "circut not available" or rigns busy.. ITS ANNOYING!!!!!!!!!!!!!!!!!!!!!!!!!!!!

me too, I think it's a bill collector....

I created a blank sound tone so my phone does not ring. I assign these calls that sound file so I am not annoyed.

Too bad we can't block phone numbers.