I used to have an optus prepaid account. It was great coz they had the free time optus prepaid to optus prepaid.
But I was wasting too much money on credit so I switched from Optus to 3 mobile. 3's good coz I got my account capped at $69, so i can spend up to $400 and only pay $69.
oh and to anyone that has my number, its still the same.