Hi,
I have tried leaving a voice mail on a 085 mobile by using the 5 in front of number but it does not work (have used it in past with 087/086) after I dial the number ie; 085 5xxxxxxxxxxx the number that comes up has 08 at the end of it which is not part of the number I dial, then there is a voice message asking if I want to leave a message for another person,(it is not possible to leave a message for person intended).
The 085 5xxxxxxx definitely works for Meteor but it was suggested in a previous thread on this topic it only can work if the Meteor customer has their voicemail set up.