I'm going to Sydney & Melbourne for a week.
Is there any prepaid sim card which I can use with my IPhone ? I want to access the Internet, email, Facebook and so on while I'm in Australia. Thank you.
Sure - all the three main carriers at least (Telstra, Optus and Vodafone) have prepaid SIMs that aren't too expensive (between $2 and $30, depending on whether they include starter credit) and will give you a reasonable amount of data. You can buy them at the carrier's shops, and large post offices and supermarkets. Recharging is possible at these places too, as well as some ATMs and of course online or by calling the toll free number. Check these links out for more info:
Telstra has the best coverage but is probably the most expensive. If you're only going to be in the metro areas of Sydney and Melbourne, any carrier should be fine.
Don't forget to make sure your iPhone is unlocked from your network before you arrive, of course!
Have a great trip :) over 7 years ago