In return for committing to the AU$19.90 spend each month, Amaysim customers will receive a saving of 25% off for the PAYG plan's call and messaging rate of 12c per unit. Amaysim says that this credit value of the Flexi plan equates to 220 minutes of calls and/or messages. If post-paid customers exceed the AU$19.90 of credit in a month, they are charged at the same 9c per unit rate for calls and messages, and 5c per MB for data. Customers also have the option to change to any other Amaysim plan at any time, without a financial penalty.