如果你個澳洲朋友係香港人, 佢又有上網+電腦, 可以叫佢用HongKongBoardBand 既 2b service, 大約60元月費就有個香港手提號碼, 然後好似 Skype, 香港朋友只要打個香港手提電話號碼就可以打去佢電腦, 佢又可以用電腦搵香港既朋友.
The main feature of this product is the hong kong mobile number, once your Australian fd near the computer, he/she can call like at hong kong.
but it depends on the internet quality, sometimes can be very bad. In that case you can call your friend free of charge. Provided your friend is HK guy studying there / work there.
Hope it helps.