Djever want to call someone but not talk to them? As in leave a message on their cell phone when you know their phone is switched on?

Here ya go:

0650-11 (then seven digit number)
0664-77 (then seven digit number)
0676-22 (then seven digit number)
0699-3 (replace 06991 with 06993 then seven digit number)

You can also use this to find out what stranger was just now trying to call you.

If your phone account provides caller ID, you can always mask your phone calls by dialing #13* and then the number.

So to maybe identify that stranger by listening to their voice mail announcement call the number back with, for example,

#13*0676221234567 (#13*-0676-22-1234567)

Got that?