@RClem
you could use prepaid sim muna pagdating mo sa oz.. I recommend Optus kase ok yung signal and it doesnt cost as much as Telstra..
Telstra > good signal, expensive charges
Vodaphone > cheap rates, bad signal
Optus > relatively good signal, average charges
once you subscribe for a plan, you can keep your prepaid number and transfer it as post paid.
Also, i know optus also has sim cards for overseas calls. cheaper ang rates. basta keep your PH sim for roaming para tipid yung family and friends mo pag nagtetext sayo.