I have a Bali sim card that I have brought back with me. I only used it for a few text messages and to receive calls, so it still has alot of text credit.If you use it for phone calls in Bali it will use the credit very quick. At least you will have a number to give family and friends before you leave. Preferably i'd like to give to someone in Perth but doesn't really matter.Leave details...first come ...first served.