In Reply to: Sim card - do you get a new number posted by Ferret on Friday, 9. August 2013 at 21:31 Bali Time:
You will be given a new number that requires people in Australia to use the +62 prefix as it is an Indonesian one.
Don't forget to ask for the code so that the calls you make to Aus are extremely cheap.
It is well worth the effort to save getting a "surprise" phone bill. Unless you need two sim cards I would take both out and disconnect your roaming function.