it cant be dne ,, optus doesnt hav any rec of sim ore than 6 mths , its been allocated to some1 lse nw

Hey i have a few years old simcard that is obviously inactive, but there is actually messages that i would really like to be able to get of the simcard but cant access any more due to the card being in active.
I'm wondering is there a way for it be activated like am i able to call Optus and get them to re activate it some how, and if it does get re activated some how, will the messages still be on the simcard or does it get reset?

also one last question are they able to activate it without knowing the number? xD
as i don't remember it as was years ago and i don't remember old numbers from that long ago.