cannot call back

I got a call today at 9.54 am from 24889477, and when I tried to call back, there were no response...

Got a phonecall from 24 88 94 77 . Was not able to answer and the number cannot be called? It is impossible to call this number. How come? And how can it be possible that a number is "not call-able"?

I just got a call from this number and I answered but no voice so I called back and the automatic voice answer said that it couldn´t be called- in Danish..

I received a call frm 2488 9477 today at 16.27 but can't call the number back. It says that I can't contact that number in Denmark?